diff --git a/holidays/countries/cambodia.py b/holidays/countries/cambodia.py
index f4152c52e..966faa469 100644
--- a/holidays/countries/cambodia.py
+++ b/holidays/countries/cambodia.py
@@ -27,6 +27,7 @@ class Cambodia(HolidayBase, InternationalHolidays, StaticHolidays, ThaiCalendarH
     - Based on: https://www.nbc.gov.kh/english/news_and_events/official_holiday.php
                 https://www.nbc.gov.kh/news_and_events/official_holiday.php
                 https://en.wikipedia.org/wiki/Public_holidays_in_Cambodia
+                https://admin.taftac-cambodia.org/public/pdf_file/regulation_1704245695_Z7IALJjE.pdf
 
     - Checked with: https://asean.org/wp-content/uploads/2021/12/ASEAN-National-Holidays-2022.pdf
                     https://asean.org/wp-content/uploads/2022/12/ASEAN-Public-Holidays-2023.pdf
@@ -278,6 +279,16 @@ def _populate_public_holidays(self):
         self._add_holiday(bon_om_touk, _timedelta(bon_om_touk_date, -1))
         self._add_holiday(bon_om_touk, _timedelta(bon_om_touk_date, +1))
 
+        # ទិវាសន្តិភាពនៅកម្ពុជា
+        # Status: In-Use.
+        # Dec 29, added from 2024 onwards.
+        #  - https://www.khmertimeskh.com/501424903/24-public-holidays-for-2024-peace-day-now-included/
+        #  - https://www.khmertimeskh.com/501551204/govt-announces-22-public-holidays-for-next-year/
+
+        if self._year >= 2024:
+            # Peace Day in Cambodia.
+            self._add_holiday_dec_29(tr("ទិវាសន្តិភាពនៅកម្ពុជា"))
+
 
 class KH(Cambodia):
     pass
diff --git a/holidays/locale/en_US/LC_MESSAGES/KH.po b/holidays/locale/en_US/LC_MESSAGES/KH.po
index 01604d409..78a47c369 100644
--- a/holidays/locale/en_US/LC_MESSAGES/KH.po
+++ b/holidays/locale/en_US/LC_MESSAGES/KH.po
@@ -14,9 +14,9 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Holidays 0.27\n"
+"Project-Id-Version: Holidays 0.61\n"
 "POT-Creation-Date: 2023-06-07 20:10+0700\n"
-"PO-Revision-Date: \n"
+"PO-Revision-Date: 2024-11-06 00:20+0700\n"
 "Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
 "Language-Team: Holidays Localization Team\n"
 "Language: en_US\n"
@@ -24,7 +24,7 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
-"X-Generator: Poedit 3.3.1\n"
+"X-Generator: Poedit 3.5\n"
 
 #. Khmer New Year's Replacement Holiday
 msgid "ថ្ងៃឈប់សម្រាកសងជំនួសឲ្យពិធីបុណ្យចូលឆ្នាំថ្មីប្រពៃណីជាតិ"
@@ -126,3 +126,7 @@ msgstr "Pchum Ben Day"
 #. Water Festival
 msgid "ព្រះរាជពិធីបុណ្យអុំទូក បណ្តែតប្រទីប និងសំពះព្រះខែអកអំបុក"
 msgstr "Water Festival"
+
+#. Peace Day in Cambodia.
+msgid "ទិវាសន្តិភាពនៅកម្ពុជា"
+msgstr "Peace Day in Cambodia"
diff --git a/holidays/locale/km/LC_MESSAGES/KH.po b/holidays/locale/km/LC_MESSAGES/KH.po
index 64635fa97..c8beb2936 100644
--- a/holidays/locale/km/LC_MESSAGES/KH.po
+++ b/holidays/locale/km/LC_MESSAGES/KH.po
@@ -14,9 +14,9 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Holidays 0.27\n"
+"Project-Id-Version: Holidays 0.61\n"
 "POT-Creation-Date: 2023-06-07 20:10+0700\n"
-"PO-Revision-Date: \n"
+"PO-Revision-Date: 2024-11-06 00:21+0700\n"
 "Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
 "Language-Team: Holidays Localization Team\n"
 "Language: km\n"
@@ -24,7 +24,7 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
-"X-Generator: Poedit 3.3.1\n"
+"X-Generator: Poedit 3.5\n"
 
 #. Khmer New Year's Replacement Holiday
 msgid "ថ្ងៃឈប់សម្រាកសងជំនួសឲ្យពិធីបុណ្យចូលឆ្នាំថ្មីប្រពៃណីជាតិ"
@@ -126,3 +126,7 @@ msgstr ""
 #. Water Festival
 msgid "ព្រះរាជពិធីបុណ្យអុំទូក បណ្តែតប្រទីប និងសំពះព្រះខែអកអំបុក"
 msgstr ""
+
+#. Peace Day in Cambodia.
+msgid "ទិវាសន្តិភាពនៅកម្ពុជា"
+msgstr ""
diff --git a/holidays/locale/th/LC_MESSAGES/KH.po b/holidays/locale/th/LC_MESSAGES/KH.po
index 96cbdee81..44fc3f036 100644
--- a/holidays/locale/th/LC_MESSAGES/KH.po
+++ b/holidays/locale/th/LC_MESSAGES/KH.po
@@ -14,9 +14,9 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Holidays 0.27\n"
+"Project-Id-Version: Holidays 0.61\n"
 "POT-Creation-Date: 2023-06-07 20:10+0700\n"
-"PO-Revision-Date: \n"
+"PO-Revision-Date: 2024-11-06 00:21+0700\n"
 "Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
 "Language-Team: Holidays Localization Team\n"
 "Language: th\n"
@@ -24,7 +24,7 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=1; plural=0;\n"
-"X-Generator: Poedit 3.3.1\n"
+"X-Generator: Poedit 3.5\n"
 
 #. Khmer New Year's Replacement Holiday
 msgid "ថ្ងៃឈប់សម្រាកសងជំនួសឲ្យពិធីបុណ្យចូលឆ្នាំថ្មីប្រពៃណីជាតិ"
@@ -132,3 +132,7 @@ msgstr "เทศกาลงานวันสาร์ทภจุมบิณ
 #. Water Festival
 msgid "ព្រះរាជពិធីបុណ្យអុំទូក បណ្តែតប្រទីប និងសំពះព្រះខែអកអំបុក"
 msgstr "พระราชพิธีบุญแข่งเรือลอยกระทงไฟไหว้พระจันทร์และกินข้าวเม่า"
+
+#. Peace Day in Cambodia.
+msgid "ទិវាសន្តិភាពនៅកម្ពុជា"
+msgstr "วันสันติภาพกัมพูชา"
diff --git a/snapshots/countries/KH_COMMON.json b/snapshots/countries/KH_COMMON.json
index ddf1f0c49..0efb6ce2f 100644
--- a/snapshots/countries/KH_COMMON.json
+++ b/snapshots/countries/KH_COMMON.json
@@ -740,6 +740,7 @@
     "2024-11-14": "Water Festival",
     "2024-11-15": "Water Festival",
     "2024-11-16": "Water Festival",
+    "2024-12-29": "Peace Day in Cambodia",
     "2025-01-01": "International New Year Day",
     "2025-01-07": "Day of Victory over the Genocidal Regime",
     "2025-03-08": "International Women's Rights Day",
@@ -761,6 +762,7 @@
     "2025-11-05": "Water Festival",
     "2025-11-06": "Water Festival",
     "2025-11-09": "National Independence Day",
+    "2025-12-29": "Peace Day in Cambodia",
     "2026-01-01": "International New Year Day",
     "2026-01-07": "Day of Victory over the Genocidal Regime",
     "2026-03-08": "International Women's Rights Day",
@@ -781,6 +783,7 @@
     "2026-11-23": "Water Festival",
     "2026-11-24": "Water Festival",
     "2026-11-25": "Water Festival",
+    "2026-12-29": "Peace Day in Cambodia",
     "2027-01-01": "International New Year Day",
     "2027-01-07": "Day of Victory over the Genocidal Regime",
     "2027-03-08": "International Women's Rights Day",
@@ -802,6 +805,7 @@
     "2027-11-12": "Water Festival",
     "2027-11-13": "Water Festival",
     "2027-11-14": "Water Festival",
+    "2027-12-29": "Peace Day in Cambodia",
     "2028-01-01": "International New Year Day",
     "2028-01-07": "Day of Victory over the Genocidal Regime",
     "2028-03-08": "International Women's Rights Day",
@@ -823,6 +827,7 @@
     "2028-11-01": "Water Festival",
     "2028-11-02": "Water Festival",
     "2028-11-09": "National Independence Day",
+    "2028-12-29": "Peace Day in Cambodia",
     "2029-01-01": "International New Year Day",
     "2029-01-07": "Day of Victory over the Genocidal Regime",
     "2029-03-08": "International Women's Rights Day",
@@ -843,6 +848,7 @@
     "2029-11-19": "Water Festival",
     "2029-11-20": "Water Festival",
     "2029-11-21": "Water Festival",
+    "2029-12-29": "Peace Day in Cambodia",
     "2030-01-01": "International New Year Day",
     "2030-01-07": "Day of Victory over the Genocidal Regime",
     "2030-03-08": "International Women's Rights Day",
@@ -863,6 +869,7 @@
     "2030-11-08": "Water Festival",
     "2030-11-09": "National Independence Day; Water Festival",
     "2030-11-10": "Water Festival",
+    "2030-12-29": "Peace Day in Cambodia",
     "2031-01-01": "International New Year Day",
     "2031-01-07": "Day of Victory over the Genocidal Regime",
     "2031-03-08": "International Women's Rights Day",
@@ -883,6 +890,7 @@
     "2031-11-27": "Water Festival",
     "2031-11-28": "Water Festival",
     "2031-11-29": "Water Festival",
+    "2031-12-29": "Peace Day in Cambodia",
     "2032-01-01": "International New Year Day",
     "2032-01-07": "Day of Victory over the Genocidal Regime",
     "2032-03-08": "International Women's Rights Day",
@@ -904,6 +912,7 @@
     "2032-11-16": "Water Festival",
     "2032-11-17": "Water Festival",
     "2032-11-18": "Water Festival",
+    "2032-12-29": "Peace Day in Cambodia",
     "2033-01-01": "International New Year Day",
     "2033-01-07": "Day of Victory over the Genocidal Regime",
     "2033-03-08": "International Women's Rights Day",
@@ -924,6 +933,7 @@
     "2033-11-06": "Water Festival",
     "2033-11-07": "Water Festival",
     "2033-11-09": "National Independence Day",
+    "2033-12-29": "Peace Day in Cambodia",
     "2034-01-01": "International New Year Day",
     "2034-01-07": "Day of Victory over the Genocidal Regime",
     "2034-03-08": "International Women's Rights Day",
@@ -945,6 +955,7 @@
     "2034-11-24": "Water Festival",
     "2034-11-25": "Water Festival",
     "2034-11-26": "Water Festival",
+    "2034-12-29": "Peace Day in Cambodia",
     "2035-01-01": "International New Year Day",
     "2035-01-07": "Day of Victory over the Genocidal Regime",
     "2035-03-08": "International Women's Rights Day",
@@ -966,6 +977,7 @@
     "2035-11-14": "Water Festival",
     "2035-11-15": "Water Festival",
     "2035-11-16": "Water Festival",
+    "2035-12-29": "Peace Day in Cambodia",
     "2036-01-01": "International New Year Day",
     "2036-01-07": "Day of Victory over the Genocidal Regime",
     "2036-03-08": "International Women's Rights Day",
@@ -986,6 +998,7 @@
     "2036-11-03": "Water Festival",
     "2036-11-04": "Water Festival",
     "2036-11-09": "National Independence Day",
+    "2036-12-29": "Peace Day in Cambodia",
     "2037-01-01": "International New Year Day",
     "2037-01-07": "Day of Victory over the Genocidal Regime",
     "2037-03-08": "International Women's Rights Day",
@@ -1007,6 +1020,7 @@
     "2037-11-21": "Water Festival",
     "2037-11-22": "Water Festival",
     "2037-11-23": "Water Festival",
+    "2037-12-29": "Peace Day in Cambodia",
     "2038-01-01": "International New Year Day",
     "2038-01-07": "Day of Victory over the Genocidal Regime",
     "2038-03-08": "International Women's Rights Day",
@@ -1028,6 +1042,7 @@
     "2038-11-10": "Water Festival",
     "2038-11-11": "Water Festival",
     "2038-11-12": "Water Festival",
+    "2038-12-29": "Peace Day in Cambodia",
     "2039-01-01": "International New Year Day",
     "2039-01-07": "Day of Victory over the Genocidal Regime",
     "2039-03-08": "International Women's Rights Day",
@@ -1049,6 +1064,7 @@
     "2039-10-31": "Water Festival",
     "2039-11-01": "Water Festival",
     "2039-11-09": "National Independence Day",
+    "2039-12-29": "Peace Day in Cambodia",
     "2040-01-01": "International New Year Day",
     "2040-01-07": "Day of Victory over the Genocidal Regime",
     "2040-03-08": "International Women's Rights Day",
@@ -1070,6 +1086,7 @@
     "2040-11-17": "Water Festival",
     "2040-11-18": "Water Festival",
     "2040-11-19": "Water Festival",
+    "2040-12-29": "Peace Day in Cambodia",
     "2041-01-01": "International New Year Day",
     "2041-01-07": "Day of Victory over the Genocidal Regime",
     "2041-03-08": "International Women's Rights Day",
@@ -1089,6 +1106,7 @@
     "2041-11-07": "Water Festival",
     "2041-11-08": "Water Festival",
     "2041-11-09": "National Independence Day",
+    "2041-12-29": "Peace Day in Cambodia",
     "2042-01-01": "International New Year Day",
     "2042-01-07": "Day of Victory over the Genocidal Regime",
     "2042-03-08": "International Women's Rights Day",
@@ -1110,6 +1128,7 @@
     "2042-11-25": "Water Festival",
     "2042-11-26": "Water Festival",
     "2042-11-27": "Water Festival",
+    "2042-12-29": "Peace Day in Cambodia",
     "2043-01-01": "International New Year Day",
     "2043-01-07": "Day of Victory over the Genocidal Regime",
     "2043-03-08": "International Women's Rights Day",
@@ -1131,6 +1150,7 @@
     "2043-11-15": "Water Festival",
     "2043-11-16": "Water Festival",
     "2043-11-17": "Water Festival",
+    "2043-12-29": "Peace Day in Cambodia",
     "2044-01-01": "International New Year Day",
     "2044-01-07": "Day of Victory over the Genocidal Regime",
     "2044-03-08": "International Women's Rights Day",
@@ -1152,6 +1172,7 @@
     "2044-11-04": "Water Festival",
     "2044-11-05": "Water Festival",
     "2044-11-09": "National Independence Day",
+    "2044-12-29": "Peace Day in Cambodia",
     "2045-01-01": "International New Year Day",
     "2045-01-07": "Day of Victory over the Genocidal Regime",
     "2045-03-08": "International Women's Rights Day",
@@ -1173,6 +1194,7 @@
     "2045-11-22": "Water Festival",
     "2045-11-23": "Water Festival",
     "2045-11-24": "Water Festival",
+    "2045-12-29": "Peace Day in Cambodia",
     "2046-01-01": "International New Year Day",
     "2046-01-07": "Day of Victory over the Genocidal Regime",
     "2046-03-08": "International Women's Rights Day",
@@ -1194,6 +1216,7 @@
     "2046-11-12": "Water Festival",
     "2046-11-13": "Water Festival",
     "2046-11-14": "Water Festival",
+    "2046-12-29": "Peace Day in Cambodia",
     "2047-01-01": "International New Year Day",
     "2047-01-07": "Day of Victory over the Genocidal Regime",
     "2047-03-08": "International Women's Rights Day",
@@ -1215,6 +1238,7 @@
     "2047-11-02": "Water Festival",
     "2047-11-03": "Water Festival",
     "2047-11-09": "National Independence Day",
+    "2047-12-29": "Peace Day in Cambodia",
     "2048-01-01": "International New Year Day",
     "2048-01-07": "Day of Victory over the Genocidal Regime",
     "2048-03-08": "International Women's Rights Day",
@@ -1235,6 +1259,7 @@
     "2048-11-19": "Water Festival",
     "2048-11-20": "Water Festival",
     "2048-11-21": "Water Festival",
+    "2048-12-29": "Peace Day in Cambodia",
     "2049-01-01": "International New Year Day",
     "2049-01-07": "Day of Victory over the Genocidal Regime",
     "2049-03-08": "International Women's Rights Day",
@@ -1255,6 +1280,7 @@
     "2049-11-08": "Water Festival",
     "2049-11-09": "National Independence Day; Water Festival",
     "2049-11-10": "Water Festival",
+    "2049-12-29": "Peace Day in Cambodia",
     "2050-01-01": "International New Year Day",
     "2050-01-07": "Day of Victory over the Genocidal Regime",
     "2050-03-08": "International Women's Rights Day",
@@ -1274,5 +1300,6 @@
     "2050-11-09": "National Independence Day",
     "2050-11-27": "Water Festival",
     "2050-11-28": "Water Festival",
-    "2050-11-29": "Water Festival"
+    "2050-11-29": "Water Festival",
+    "2050-12-29": "Peace Day in Cambodia"
 }
diff --git a/tests/countries/test_cambodia.py b/tests/countries/test_cambodia.py
index 9160fecc8..a2796661a 100644
--- a/tests/countries/test_cambodia.py
+++ b/tests/countries/test_cambodia.py
@@ -161,26 +161,25 @@ def test_sangkranta(self):
 
     def test_king_sihamoni_birthday(self):
         name = "ព្រះរាជពិធីបុណ្យចម្រើនព្រះជន្ម ព្រះករុណា ព្រះបាទសម្តេចព្រះបរមនាថ នរោត្តម សីហមុនី"
-        self.assertNoHolidayName(name, 2004)
         self.assertHolidayName(name, (f"{year}-05-13" for year in range(2005, 2020)))
         self.assertHolidayName(name, (f"{year}-05-14" for year in range(2005, 2050)))
         self.assertHolidayName(name, (f"{year}-05-15" for year in range(2005, 2020)))
+        self.assertNoHolidayName(name, range(1993, 2005))
 
     def test_national_day_of_remembrance(self):
         name = "ទិវាជាតិនៃការចងចាំ"
-        self.assertNoHolidayName(name, 2017)
         self.assertHolidayName(name, (f"{year}-05-20" for year in range(2018, 2020)))
-        self.assertNoHolidayName(name, 2020)
+        self.assertNoHolidayName(name, range(1993, 2018), range(2020, 2050))
 
     def test_international_children_day(self):
         name = "ទិវាកុមារអន្តរជាតិ"
         self.assertHolidayName(name, (f"{year}-06-01" for year in range(1993, 2020)))
-        self.assertNoHolidayName(name, 2020)
+        self.assertNoHolidayName(name, range(2020, 2050))
 
     def test_queen_mother_monineath_birthday(self):
         name = "ព្រះរាជពិធីបុណ្យចម្រើនព្រះជន្ម សម្តេចព្រះមហាក្សត្រី ព្រះវររាជមាតា នរោត្តម មុនិនាថ សីហនុ"
-        self.assertNoHolidayName(name, 1993)
         self.assertHolidayName(name, (f"{year}-06-18" for year in range(1994, 2050)))
+        self.assertNoHolidayName(name, 1993)
 
     def test_constitution_day(self):
         self.assertHolidayName(
@@ -193,13 +192,13 @@ def test_king_sihanouk_memorial_day(self):
             " នរោត្តម សីហនុ ព្រះមហាវីរក្សត្រ ព្រះវររាជបិតាឯករាជ្យ បូរណភាពទឹកដី"
             " និងឯកភាពជាតិខ្មែរ ព្រះបរមរតនកោដ្ឋ"
         )
-        self.assertNoHolidayName(name, 2011)
         self.assertHolidayName(name, (f"{year}-10-15" for year in range(2012, 2050)))
+        self.assertNoHolidayName(name, range(1993, 2012))
 
     def test_paris_peace_agreement_day(self):
         name = "ទិវារំលឹកសន្ធិសញ្ញាសន្តិភាពទីក្រុងប៉ារីស"
         self.assertHolidayName(name, (f"{year}-10-23" for year in range(1993, 2020)))
-        self.assertNoHolidayName(name, 2020)
+        self.assertNoHolidayName(name, range(2020, 2050))
 
     def test_king_sihamoni_coronation_day(self):
         name = (
@@ -207,8 +206,8 @@ def test_king_sihamoni_coronation_day(self):
             "ព្រះបាទសម្តេចព្រះបរមនាថ នរោត្តម សីហមុនី "
             "ព្រះមហាក្សត្រនៃព្រះរាជាណាចក្រកម្ពុជា"
         )
-        self.assertNoHolidayName(name, 2003)
         self.assertHolidayName(name, (f"{year}-10-29" for year in range(2004, 2050)))
+        self.assertNoHolidayName(name, range(1993, 2004))
 
     def test_national_independence_day(self):
         self.assertHolidayName("ពិធីបុណ្យឯករាជ្យជាតិ", (f"{year}-11-09" for year in range(1993, 2050)))
@@ -216,7 +215,12 @@ def test_national_independence_day(self):
     def test_international_human_rights_day(self):
         name = "ទិវាសិទ្ធិមនុស្សអន្តរជាតិ"
         self.assertHolidayName(name, (f"{year}-12-10" for year in range(1993, 2020)))
-        self.assertNoHolidayName(name, 2020)
+        self.assertNoHolidayName(name, range(2020, 2050))
+
+    def test_peace_day_in_cambodia(self):
+        name = "ទិវាសន្តិភាពនៅកម្ពុជា"
+        self.assertHolidayName(name, (f"{year}-12-29" for year in range(2024, 2050)))
+        self.assertNoHolidayName(name, range(1993, 2024))
 
     def test_pchum_ben(self):
         name = "ពិធីបុណ្យភ្ផុំបិណ្ឌ"
@@ -284,7 +288,6 @@ def test_bon_om_touk(self):
             "2023-11-27",
             "2023-11-28",
         )
-        self.assertNoHolidayName(name, 2158)
 
     def test_l10n_default(self):
         self.assertLocalizedHolidays(