diff --git a/changelogs/fragments/6759.yml b/changelogs/fragments/6759.yml
new file mode 100644
index 000000000000..ef7e5cddddda
--- /dev/null
+++ b/changelogs/fragments/6759.yml
@@ -0,0 +1,2 @@
+feat:
+- Make Field Name Search Filter Case Insensitive ([#6759](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6759))
\ No newline at end of file
diff --git a/src/plugins/discover/public/application/components/sidebar/lib/field_filter.ts b/src/plugins/discover/public/application/components/sidebar/lib/field_filter.ts
index d72af29b43e0..599e546058d2 100644
--- a/src/plugins/discover/public/application/components/sidebar/lib/field_filter.ts
+++ b/src/plugins/discover/public/application/components/sidebar/lib/field_filter.ts
@@ -83,7 +83,8 @@ export function isFieldFiltered(
     field.type === '_source' ||
     field.scripted ||
     fieldCounts[field.name] > 0;
-  const matchName = !filterState.name || field.name.indexOf(filterState.name) !== -1;
+  const matchName =
+    !filterState.name || field.name.toLowerCase().indexOf(filterState.name.toLowerCase()) !== -1; // case insensitive matching name
 
   return matchFilter && isAggregatable && isSearchable && scriptedOrMissing && matchName;
 }