diff --git a/.changeset/fix-select-panel-item-dividers.md b/.changeset/fix-select-panel-item-dividers.md
new file mode 100644
index 00000000000..3be425d297e
--- /dev/null
+++ b/.changeset/fix-select-panel-item-dividers.md
@@ -0,0 +1,5 @@
+---
+'@primer/react': patch
+---
+
+Fix item dividers not visible in SelectPanel and FilteredActionList when `showItemDividers` is enabled, caused by `content-visibility: auto` clipping the absolutely-positioned divider pseudo-elements.
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-dark-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-dark-high-contrast-linux.png
index 0c9aea565d4..b127306fce6 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-dark-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-dark-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-light-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-light-high-contrast-linux.png
index 69f3674a2ee..23ed6a25234 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-light-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Above-Tall-Body-light-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-dark-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-dark-high-contrast-linux.png
index c7d2960b6a7..bc2cd8165b0 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-dark-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-dark-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-light-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-light-high-contrast-linux.png
index d6123935ee5..05868292c03 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-light-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Initial-with-Underflowing-Items-light-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-dark-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-dark-high-contrast-linux.png
index d089587b0ec..17298b23c0c 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-dark-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-dark-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-light-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-light-high-contrast-linux.png
index 456e11f713d..4a8666c9785 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-light-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Height-Variations-and-Scroll-light-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-dark-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-dark-high-contrast-linux.png
index 566b06a4bbd..a33597b8504 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-dark-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-dark-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-light-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-light-high-contrast-linux.png
index 4b68e2b8764..534cdfc6eb7 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-light-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-With-Item-Dividers-light-high-contrast-linux.png differ
diff --git a/packages/react/src/FilteredActionList/FilteredActionList.module.css b/packages/react/src/FilteredActionList/FilteredActionList.module.css
index 2ee59feb013..1f3dd981726 100644
--- a/packages/react/src/FilteredActionList/FilteredActionList.module.css
+++ b/packages/react/src/FilteredActionList/FilteredActionList.module.css
@@ -23,6 +23,13 @@
     content-visibility: auto;
     contain-intrinsic-size: auto 32px;
   }
+
+  /* When showDividers is enabled, divider ::before pseudo-elements on ActionListSubContent are
+     positioned outside the item bounds (top: -7px). content-visibility: auto applies paint containment
+     which clips these, so we must disable it for items in lists with dividers. */
+  & [data-dividers='true'] .ActionListItem {
+    content-visibility: visible;
+  }
 }
 
 .ActionList {