diff --git a/CHANGELOG.next.md b/CHANGELOG.next.md
index 2808917833..fc737b9456 100644
--- a/CHANGELOG.next.md
+++ b/CHANGELOG.next.md
@@ -25,6 +25,8 @@ Thanks, you're awesome :-) -->
 
 #### Deprecated
 
+* Note deprecation of the `host.user.*` field reuse. #1422
+
 ### Tooling and Artifact Changes
 
 #### Bugfixes
diff --git a/docs/field-details.asciidoc b/docs/field-details.asciidoc
index a18639a396..ea245be4c7 100644
--- a/docs/field-details.asciidoc
+++ b/docs/field-details.asciidoc
@@ -4143,7 +4143,7 @@ example: `1325`
 
 | <<ecs-user,user>>
 | `host.user.*`
-| Fields to describe the user relevant to the event.
+| This reuse is deprecated and will be removed in the next major ECS version.
 
 // ===============================================================
 
diff --git a/experimental/generated/ecs/ecs_nested.yml b/experimental/generated/ecs/ecs_nested.yml
index 7433479948..c972da00ae 100644
--- a/experimental/generated/ecs/ecs_nested.yml
+++ b/experimental/generated/ecs/ecs_nested.yml
@@ -6159,7 +6159,7 @@ host:
     short: OS fields contain information about the operating system.
   - full: host.user
     schema_name: user
-    short: Fields to describe the user relevant to the event.
+    short: This reuse is deprecated and will be removed in the next major ECS version.
   short: Fields describing the relevant computing instance.
   title: Host
   type: group
@@ -15831,9 +15831,6 @@ user:
     - as: user
       at: destination
       full: destination.user
-    - as: user
-      at: host
-      full: host.user
     - as: user
       at: server
       full: server.user
@@ -15852,6 +15849,11 @@ user:
       at: user
       full: user.changes
       short_override: Captures changes made to a user.
+    - as: user
+      at: host
+      full: host.user
+      short_override: This reuse is deprecated and will be removed in the next major
+        ECS version.
     top_level: true
   reused_here:
   - full: user.group
diff --git a/generated/ecs/ecs_nested.yml b/generated/ecs/ecs_nested.yml
index 6c3e37c1bf..6dc80d80a7 100644
--- a/generated/ecs/ecs_nested.yml
+++ b/generated/ecs/ecs_nested.yml
@@ -5437,7 +5437,7 @@ host:
     short: OS fields contain information about the operating system.
   - full: host.user
     schema_name: user
-    short: Fields to describe the user relevant to the event.
+    short: This reuse is deprecated and will be removed in the next major ECS version.
   short: Fields describing the relevant computing instance.
   title: Host
   type: group
@@ -12255,9 +12255,6 @@ user:
     - as: user
       at: destination
       full: destination.user
-    - as: user
-      at: host
-      full: host.user
     - as: user
       at: server
       full: server.user
@@ -12276,6 +12273,11 @@ user:
       at: user
       full: user.changes
       short_override: Captures changes made to a user.
+    - as: user
+      at: host
+      full: host.user
+      short_override: This reuse is deprecated and will be removed in the next major
+        ECS version.
     top_level: true
   reused_here:
   - full: user.group
diff --git a/schemas/user.yml b/schemas/user.yml
index df4c71dbb4..c18613bb88 100644
--- a/schemas/user.yml
+++ b/schemas/user.yml
@@ -15,7 +15,6 @@
     expected:
       - client
       - destination
-      - host
       - server
       - source
       - at: user
@@ -27,6 +26,9 @@
       - at: user
         as: changes
         short_override: Captures changes made to a user.
+      - at: host
+        as: user
+        short_override: This reuse is deprecated and will be removed in the next major ECS version.
 
       # TODO Temporarily commented out to simplify initial rewrite review