diff --git a/.changeset/violet-yaks-lie.md b/.changeset/violet-yaks-lie.md
new file mode 100644
index 00000000000..c17720f1334
--- /dev/null
+++ b/.changeset/violet-yaks-lie.md
@@ -0,0 +1,5 @@
+---
+'@primer/react': patch
+---
+
+SelectPanel: Fixes a bug in `SelectPanel` when the list of items was not memoized.
diff --git a/packages/react/src/SelectPanel/SelectPanel.test.tsx b/packages/react/src/SelectPanel/SelectPanel.test.tsx
index fa9b8771dfb..474ef3499fe 100644
--- a/packages/react/src/SelectPanel/SelectPanel.test.tsx
+++ b/packages/react/src/SelectPanel/SelectPanel.test.tsx
@@ -1,5 +1,6 @@
-import {render as HTMLRender} from '@testing-library/react'
+import {render as HTMLRender, fireEvent, getByRole, getByText} from '@testing-library/react'
 import axe from 'axe-core'
+
 import React from 'react'
 import theme from '../theme'
 import {SelectPanel} from '../SelectPanel'
@@ -7,9 +8,14 @@ import {behavesAsComponent, checkExports} from '../utils/testing'
 import {BaseStyles, SSRProvider, ThemeProvider} from '..'
 import type {ItemInput} from '../deprecated/ActionList/List'
 
-const items = [{text: 'Foo'}, {text: 'Bar'}, {text: 'Baz'}, {text: 'Bon'}] as ItemInput[]
-
 function SimpleSelectPanel(): JSX.Element {
+  const items = [
+    {text: 'Foo', id: 'foo'},
+    {text: 'Bar', id: 'bar'},
+    {text: 'Baz', id: 'baz'},
+    {text: 'Bon', id: 'bon'},
+  ] as ItemInput[]
+
   const [selected, setSelected] = React.useState<ItemInput[]>([])
   const [, setFilter] = React.useState('')
   const [open, setOpen] = React.useState(false)
@@ -27,6 +33,7 @@ function SimpleSelectPanel(): JSX.Element {
             onFilterChange={setFilter}
             open={open}
             onOpenChange={setOpen}
+            overlayProps={{width: 'medium', height: 'medium'}}
           />
           <div id="portal-root"></div>
         </BaseStyles>
@@ -36,10 +43,18 @@ function SimpleSelectPanel(): JSX.Element {
 }
 
 describe('SelectPanel', () => {
+  const originalScrollTo = Element.prototype.scrollTo
+  beforeAll(() => {
+    Element.prototype.scrollTo = () => {}
+  })
   afterEach(() => {
     jest.clearAllMocks()
   })
 
+  afterAll(() => {
+    Element.prototype.scrollTo = originalScrollTo
+  })
+
   behavesAsComponent({
     Component: SelectPanel,
     options: {skipAs: true, skipSx: true},
@@ -56,4 +71,20 @@ describe('SelectPanel', () => {
     const results = await axe.run(container)
     expect(results).toHaveNoViolations()
   })
+
+  it('should render selected items', () => {
+    const item = HTMLRender(<SimpleSelectPanel />)
+    const {container} = item
+    const button = getByRole(container, 'button')
+    expect(button).toBeTruthy()
+
+    fireEvent.click(button)
+    const selector = getByText(container, 'Foo')
+    expect(selector).toBeVisible()
+
+    fireEvent.click(selector)
+
+    const selected = getByRole(container, 'option', {selected: true})
+    expect(selected).toBeTruthy()
+  })
 })
diff --git a/packages/react/src/SelectPanel/SelectPanel.tsx b/packages/react/src/SelectPanel/SelectPanel.tsx
index 73bbcaa5948..e937bfe496c 100644
--- a/packages/react/src/SelectPanel/SelectPanel.tsx
+++ b/packages/react/src/SelectPanel/SelectPanel.tsx
@@ -126,9 +126,24 @@ export function SelectPanel({
     }
   }, [placeholder, renderAnchor, selected])
 
+  const testIsItemSelected = React.useCallback((selectedItem: ItemInput, item: ItemInput) => {
+    const itemType = typeof selectedItem
+    if (itemType === 'object') {
+      if (selectedItem.hasOwnProperty('id')) {
+        return selectedItem.id === item.id
+      }
+    }
+
+    return selectedItem === item
+  }, [])
+
   const itemsToRender = useMemo(() => {
     return items.map(item => {
-      const isItemSelected = isMultiSelectVariant(selected) ? selected.includes(item) : selected === item
+      const isItemSelected = isMultiSelectVariant(selected)
+        ? selected.some(selectedItem => {
+            return testIsItemSelected(selectedItem, item)
+          })
+        : selected === item
 
       return {
         ...item,
@@ -142,8 +157,13 @@ export function SelectPanel({
           }
 
           if (isMultiSelectVariant(selected)) {
-            const otherSelectedItems = selected.filter(selectedItem => selectedItem !== item)
-            const newSelectedItems = selected.includes(item) ? otherSelectedItems : [...otherSelectedItems, item]
+            const wasPreviouslySelected = selected.some(selectedItem => {
+              return testIsItemSelected(selectedItem, item)
+            })
+            const otherSelectedItems = selected.filter(selectedItem => {
+              return !testIsItemSelected(selectedItem, item)
+            })
+            const newSelectedItems = wasPreviouslySelected ? otherSelectedItems : [...otherSelectedItems, item]
 
             const multiSelectOnChange = onSelectedChange as SelectPanelMultiSelection['onSelectedChange']
             multiSelectOnChange(newSelectedItems)
@@ -157,7 +177,7 @@ export function SelectPanel({
         },
       } as ItemProps
     })
-  }, [onClose, onSelectedChange, items, selected])
+  }, [onClose, onSelectedChange, items, selected, testIsItemSelected])
 
   const inputRef = React.useRef<HTMLInputElement>(null)
   const focusTrapSettings = {