diff --git a/.changeset/thin-rocks-chew.md b/.changeset/thin-rocks-chew.md
new file mode 100644
index 00000000000..b961df42747
--- /dev/null
+++ b/.changeset/thin-rocks-chew.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": minor
+---
+
+SelectPanel: Add `subtitle` prop
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-colorblind-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-colorblind-linux.png
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diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-dimmed-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-dimmed-linux.png
index f5f5194946f..7aa136a75a4 100644
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diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-high-contrast-linux.png
index 7b9adeee31e..11fe80f7494 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-high-contrast-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-high-contrast-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-linux.png
index b550d516d0e..e31754dc71b 100644
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diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-tritanopia-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-dark-tritanopia-linux.png
index 20e2df55464..831c50ce493 100644
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diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-colorblind-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-colorblind-linux.png
index 60c30e14c81..972df3b1205 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-colorblind-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-colorblind-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-high-contrast-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-high-contrast-linux.png
index bb7338c62a8..59d3d1f8b8d 100644
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diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-linux.png
index 9cd79dbea35..51edaef8f0b 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-linux.png differ
diff --git a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-tritanopia-linux.png b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-tritanopia-linux.png
index 60c30e14c81..972df3b1205 100644
Binary files a/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-tritanopia-linux.png and b/.playwright/snapshots/components/SelectPanel.test.ts-snapshots/SelectPanel-Default-light-tritanopia-linux.png differ
diff --git a/generated/components.json b/generated/components.json
index 2bc6b888da9..7def235b8e7 100644
--- a/generated/components.json
+++ b/generated/components.json
@@ -3626,7 +3626,7 @@
       "stories": [
         {
           "id": "components-selectpanel--default",
-          "code": "() => {\n  const [selected, setSelected] = React.useState<ItemInput[]>([\n    items[0],\n    items[1],\n  ])\n  const [filter, setFilter] = React.useState('')\n  const filteredItems = items.filter((item) =>\n    item.text.toLowerCase().startsWith(filter.toLowerCase()),\n  )\n  const [open, setOpen] = useState(false)\n  return (\n    <>\n      <h1>Multi Select Panel</h1>\n      <div>Please select labels that describe your issue:</div>\n      <SelectPanel\n        title=\"Select labels\"\n        renderAnchor={({\n          children,\n          'aria-labelledby': ariaLabelledBy,\n          ...anchorProps\n        }) => (\n          <Button\n            trailingAction={TriangleDownIcon}\n            aria-labelledby={` ${ariaLabelledBy}`}\n            {...anchorProps}\n          >\n            {children ?? 'Select Labels'}\n          </Button>\n        )}\n        placeholderText=\"Filter labels\"\n        open={open}\n        onOpenChange={setOpen}\n        items={filteredItems}\n        selected={selected}\n        onSelectedChange={setSelected}\n        onFilterChange={setFilter}\n        showItemDividers={true}\n        overlayProps={{\n          width: 'small',\n          height: 'xsmall',\n        }}\n      />\n    </>\n  )\n}"
+          "code": "() => {\n  const [selected, setSelected] = React.useState<ItemInput[]>([\n    items[0],\n    items[1],\n  ])\n  const [filter, setFilter] = React.useState('')\n  const filteredItems = items.filter((item) =>\n    item.text.toLowerCase().startsWith(filter.toLowerCase()),\n  )\n  const [open, setOpen] = useState(false)\n  return (\n    <>\n      <h1>Multi Select Panel</h1>\n      <SelectPanel\n        title=\"Select labels\"\n        subtitle=\"Use labels to organize issues and pull requests\"\n        renderAnchor={({\n          children,\n          'aria-labelledby': ariaLabelledBy,\n          ...anchorProps\n        }) => (\n          <Button\n            trailingAction={TriangleDownIcon}\n            aria-labelledby={` ${ariaLabelledBy}`}\n            {...anchorProps}\n          >\n            {children ?? 'Select Labels'}\n          </Button>\n        )}\n        placeholderText=\"Filter labels\"\n        open={open}\n        onOpenChange={setOpen}\n        items={filteredItems}\n        selected={selected}\n        onSelectedChange={setSelected}\n        onFilterChange={setFilter}\n        showItemDividers={true}\n        overlayProps={{\n          width: 'medium',\n          height: 'medium',\n        }}\n      />\n    </>\n  )\n}"
         }
       ],
       "props": [
@@ -3636,6 +3636,12 @@
           "defaultValue": "\"Select an item\" or \"Select items\"",
           "description": "A descriptive title for the panel"
         },
+        {
+          "name": "subtitle",
+          "type": "string | React.ReactElement",
+          "defaultValue": "",
+          "description": "When provided, a subtitle is displayed below the title"
+        },
         {
           "name": "onOpenChange",
           "type": "( open: boolean, gesture: | 'anchor-click' | 'anchor-key-press' | 'click-outside' | 'escape' | 'selection' ) => void",
diff --git a/src/SelectPanel/SelectPanel.docs.json b/src/SelectPanel/SelectPanel.docs.json
index 7e34e9c294a..48268ae7bb2 100644
--- a/src/SelectPanel/SelectPanel.docs.json
+++ b/src/SelectPanel/SelectPanel.docs.json
@@ -11,6 +11,12 @@
       "defaultValue": "\"Select an item\" or \"Select items\"",
       "description": "A descriptive title for the panel"
     },
+    {
+      "name": "subtitle",
+      "type": "string | React.ReactElement",
+      "defaultValue": "",
+      "description": "When provided, a subtitle is displayed below the title"
+    },
     {
       "name": "onOpenChange",
       "type": "( open: boolean, gesture: | 'anchor-click' | 'anchor-key-press' | 'click-outside' | 'escape' | 'selection' ) => void",
diff --git a/src/SelectPanel/SelectPanel.stories.tsx b/src/SelectPanel/SelectPanel.stories.tsx
index 1ab7d29b47b..11206c4943b 100644
--- a/src/SelectPanel/SelectPanel.stories.tsx
+++ b/src/SelectPanel/SelectPanel.stories.tsx
@@ -50,9 +50,9 @@ export const Default = () => {
   return (
     <>
       <h1>Multi Select Panel</h1>
-      <div>Please select labels that describe your issue:</div>
       <SelectPanel
         title="Select labels"
+        subtitle="Use labels to organize issues and pull requests"
         renderAnchor={({children, 'aria-labelledby': ariaLabelledBy, ...anchorProps}) => (
           <Button trailingAction={TriangleDownIcon} aria-labelledby={` ${ariaLabelledBy}`} {...anchorProps}>
             {children ?? 'Select Labels'}
@@ -66,7 +66,7 @@ export const Default = () => {
         onSelectedChange={setSelected}
         onFilterChange={setFilter}
         showItemDividers={true}
-        overlayProps={{width: 'small', height: 'xsmall'}}
+        overlayProps={{width: 'medium', height: 'medium'}}
       />
     </>
   )
diff --git a/src/SelectPanel/SelectPanel.tsx b/src/SelectPanel/SelectPanel.tsx
index dfcac4cdd97..0075069d50d 100644
--- a/src/SelectPanel/SelectPanel.tsx
+++ b/src/SelectPanel/SelectPanel.tsx
@@ -29,6 +29,7 @@ interface SelectPanelMultiSelection {
 interface SelectPanelBaseProps {
   // TODO: Make `title` required in the next major version
   title?: string | React.ReactElement
+  subtitle?: string | React.ReactElement
   onOpenChange: (
     open: boolean,
     gesture: 'anchor-click' | 'anchor-key-press' | 'click-outside' | 'escape' | 'selection',
@@ -66,6 +67,7 @@ export function SelectPanel({
   inputLabel = placeholderText,
   selected,
   title = isMultiSelectVariant(selected) ? 'Select items' : 'Select an item',
+  subtitle,
   onSelectedChange,
   filterValue: externalFilterValue,
   onFilterChange: externalOnFilterChange,
@@ -76,6 +78,7 @@ export function SelectPanel({
   ...listProps
 }: SelectPanelProps): JSX.Element {
   const titleId = useId()
+  const subtitleId = useId()
   const [filterValue, setInternalFilterValue] = useProvidedStateOrCreate(externalFilterValue, undefined, '')
   const onFilterChange: FilteredActionListProps['onFilterChange'] = useCallback(
     (value, e) => {
@@ -168,7 +171,12 @@ export function SelectPanel({
         open={open}
         onOpen={onOpen}
         onClose={onClose}
-        overlayProps={{role: 'dialog', 'aria-labelledby': titleId, ...overlayProps}}
+        overlayProps={{
+          role: 'dialog',
+          'aria-labelledby': titleId,
+          'aria-describedby': subtitle ? subtitleId : undefined,
+          ...overlayProps,
+        }}
         focusTrapSettings={focusTrapSettings}
         focusZoneSettings={focusZoneSettings}
       >
@@ -187,6 +195,11 @@ export function SelectPanel({
             <Heading as="h1" id={titleId} sx={{fontSize: 1}}>
               {title}
             </Heading>
+            {subtitle ? (
+              <Box id={subtitleId} sx={{fontSize: 0, color: 'fg.muted'}}>
+                {subtitle}
+              </Box>
+            ) : null}
           </Box>
           <FilteredActionList
             filterValue={filterValue}
diff --git a/src/SelectPanel/__snapshots__/SelectPanel.test.tsx.snap b/src/SelectPanel/__snapshots__/SelectPanel.test.tsx.snap
index 223426357d3..1c2aff6eeb8 100644
--- a/src/SelectPanel/__snapshots__/SelectPanel.test.tsx.snap
+++ b/src/SelectPanel/__snapshots__/SelectPanel.test.tsx.snap
@@ -87,7 +87,7 @@ exports[`SelectPanel renders consistently 1`] = `
   <button
     aria-haspopup="true"
     className="c1"
-    id="react-aria-2"
+    id="react-aria-3"
     onClick={[Function]}
     onKeyDown={[Function]}
     tabIndex={0}