diff --git a/packages/syntax-core/src/Dialog/Dialog.tsx b/packages/syntax-core/src/Dialog/Dialog.tsx
index dfad9f6f..25f6ab6a 100644
--- a/packages/syntax-core/src/Dialog/Dialog.tsx
+++ b/packages/syntax-core/src/Dialog/Dialog.tsx
@@ -11,7 +11,7 @@ import classNames from "classnames";
 
 type DialogSize = "sm" | "md" | "lg";
 type DialogRounding = "lg" | "xl";
-type DialogProps = {
+export type DialogProps = {
   /** Test id for the floating dialog */
   "data-testid"?: string;
   /** aria-label for the dialog */
diff --git a/packages/syntax-core/src/Dialog/ModalDialog.module.css b/packages/syntax-core/src/Dialog/ModalDialog.module.css
new file mode 100644
index 00000000..3246acd5
--- /dev/null
+++ b/packages/syntax-core/src/Dialog/ModalDialog.module.css
@@ -0,0 +1,14 @@
+.racModalOverlay,
+.racModal {
+  visibility: visible;
+  box-sizing: border-box;
+}
+
+.racModalOverlay {
+  position: fixed;
+  inset: 0;
+}
+
+.racModal {
+  max-height: 100%;
+}
diff --git a/packages/syntax-core/src/Dialog/ModalDialog.tsx b/packages/syntax-core/src/Dialog/ModalDialog.tsx
new file mode 100644
index 00000000..732612cb
--- /dev/null
+++ b/packages/syntax-core/src/Dialog/ModalDialog.tsx
@@ -0,0 +1,129 @@
+import React, { type ReactElement, forwardRef } from "react";
+import {
+  Modal as RACModal,
+  ModalOverlay as RACModalOverlay,
+} from "react-aria-components";
+import Dialog, { type DialogProps } from "./Dialog";
+import OverlayVisibility from "../react-aria-utils/OverlayVisibility";
+import styles from "./ModalDialog.module.css";
+import Box from "../Box/Box";
+import IconButton from "../IconButton/IconButton";
+
+function XIcon({ color = "#000" }: { color?: string; className?: string }) {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill={color}>
+      <path
+        fill="inherit"
+        d="M11.25.758a.83.83 0 0 0-1.175 0L6 4.825 1.925.75A.83.83 0 1 0 .75 1.925L4.825 6 .75 10.075a.83.83 0 1 0 1.175 1.175L6 7.175l4.075 4.075a.83.83 0 1 0 1.175-1.175L7.175 6l4.075-4.075a.835.835 0 0 0 0-1.167Z"
+      />
+    </svg>
+  );
+}
+
+type ModalDialogProps = DialogProps & {
+  /** Whether dialog can be dismissed with click outside / Escape key  */
+  dismissable?: boolean;
+  /** render visible initially. */
+  initialOpen?: boolean;
+  /** Optional handler for change of visibility for dialog content.  For analytics and control */
+  onChangeContentVisibility?: (visible: boolean) => void;
+  /** Optional boolean to control open state of modal dialog externally */
+  open?: boolean;
+  /** Optional override for default dismiss button accessibility label */
+  dismissAccessibilityLabel?: string;
+};
+
+/**
+ * ModalDialog is a controlled component -- visibility is managed with the `open` prop.
+ *
+ * Example Usage:
+ ```
+  <ModalDialog
+    open={open}
+    initialOpen
+    content={<Box>I am some content</Box>}
+    onChangeContentVisibility={(visible) => ...}
+  >
+    <Box padding={2} maxWidth={400}>
+      ... some content goes here
+    </Box>
+  </ModalDialog>
+ ```
+ */
+const ModalDialog = forwardRef<HTMLDivElement, ModalDialogProps>(
+  function ModalDialog(props, ref): ReactElement {
+    const {
+      "data-testid": dataTestId,
+      accessibilityLabel,
+      children,
+      dismissable = true,
+      dismissAccessibilityLabel = "Dismiss",
+      initialOpen,
+      onChangeContentVisibility,
+      open,
+    } = props;
+
+    return (
+      <RACModalOverlay
+        isDismissable={dismissable}
+        isKeyboardDismissDisabled={!dismissable}
+        defaultOpen={initialOpen}
+        isOpen={open}
+        className={styles.racModalOverlay}
+      >
+        {({ state }) => (
+          <Box
+            padding={4} // padding/gutter from window edges
+            height="100%"
+            width="100%"
+            display="flex"
+            direction="column"
+            alignItems="center"
+            justifyContent="center"
+          >
+            <RACModal
+              ref={ref}
+              aria-label={accessibilityLabel}
+              className={styles.racModal}
+            >
+              {({ isEntering, isExiting }) => (
+                <>
+                  <OverlayVisibility
+                    isEntering={isEntering}
+                    isExiting={isExiting}
+                    onChange={onChangeContentVisibility}
+                  />
+                  <Dialog
+                    accessibilityLabel={accessibilityLabel}
+                    data-testid={dataTestId}
+                  >
+                    <Box
+                      position="absolute"
+                      padding={2}
+                      dangerouslySetInlineStyle={{
+                        __style: {
+                          top: "0",
+                          right: "0",
+                        },
+                      }}
+                    >
+                      <IconButton
+                        onClick={() => state.close()}
+                        color="tertiary"
+                        accessibilityLabel={dismissAccessibilityLabel}
+                        icon={XIcon}
+                      />
+                    </Box>
+                    {children}
+                  </Dialog>
+                </>
+              )}
+            </RACModal>
+          </Box>
+        )}
+      </RACModalOverlay>
+    );
+  },
+);
+
+export default ModalDialog;
diff --git a/packages/syntax-core/src/Popover/Popover.module.css b/packages/syntax-core/src/Popover/Popover.module.css
index f4f23d8b..85d8020a 100644
--- a/packages/syntax-core/src/Popover/Popover.module.css
+++ b/packages/syntax-core/src/Popover/Popover.module.css
@@ -4,20 +4,6 @@
   padding: 4px 16px 16px;
   display: flex;
   flex-direction: column;
-}
-
-.racPopover,
-.racModalOverlay,
-.racModal {
   visibility: visible;
   box-sizing: border-box;
 }
-
-.racModalOverlay {
-  position: fixed;
-  inset: 0;
-}
-
-.racModal {
-  max-height: 100%;
-}
diff --git a/packages/syntax-core/src/Popover/Popover.tsx b/packages/syntax-core/src/Popover/Popover.tsx
index cdd3d3ee..d68da65c 100644
--- a/packages/syntax-core/src/Popover/Popover.tsx
+++ b/packages/syntax-core/src/Popover/Popover.tsx
@@ -1,23 +1,15 @@
-import React, {
-  type ReactNode,
-  forwardRef,
-  type ReactElement,
-  type ComponentProps,
-} from "react";
+import React, { type ReactNode, forwardRef, type ReactElement } from "react";
 import { type Placement as RAPlacement } from "react-aria";
 import {
   Popover as RACPopover,
   DialogTrigger as RACDialogTrigger,
-  Modal as RACModal,
-  ModalOverlay as RACModalOverlay,
 } from "react-aria-components";
-import Box from "../Box/Box";
 import Typography from "../Typography/Typography";
-import IconButton from "../IconButton/IconButton";
 import styles from "./Popover.module.css";
 import Triggerable from "../react-aria-utils/Triggerable";
 import OverlayVisibility from "../react-aria-utils/OverlayVisibility";
 import Dialog from "../Dialog/Dialog";
+import ModalDialog from "../Dialog/ModalDialog";
 
 type Placement = "top" | "end" | "bottom" | "start";
 
@@ -156,123 +148,3 @@ const Popover = forwardRef<HTMLDivElement, PopoverProps>(function Popover(
 });
 
 export default Popover;
-
-function XIcon({ color = "#000" }: { color?: string; className?: string }) {
-  return (
-    <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill={color}>
-      <path
-        fill="inherit"
-        d="M11.25.758a.83.83 0 0 0-1.175 0L6 4.825 1.925.75A.83.83 0 1 0 .75 1.925L4.825 6 .75 10.075a.83.83 0 1 0 1.175 1.175L6 7.175l4.075 4.075a.83.83 0 1 0 1.175-1.175L7.175 6l4.075-4.075a.835.835 0 0 0 0-1.167Z"
-      />
-    </svg>
-  );
-}
-
-/**
- * ModalDialog is a controlled component -- visibility is managed with the `open` prop.
- *
- * Example Usage:
- ```
-  <ModalDialog
-    open={open}
-    initialOpen
-    content={(
-    )}
-    onChangeContentVisibility={(visible) => ...}
-  >
-    <Box padding={2} maxWidth={400}>
-      ... some content goes here
-    </Box>
-  </ModalDialog>
- ```
- */
-const ModalDialog = forwardRef<
-  HTMLDivElement,
-  ComponentProps<typeof Dialog> & {
-    /** Whether dialog can be dismissed with click outside / Escape key  */
-    dismissable?: boolean;
-    /** render visible initially. */
-    initialOpen?: boolean;
-    /** Optional handler for change of visibility for dialog content.  For analytics and control */
-    onChangeContentVisibility?: (visible: boolean) => void;
-    /** Optional boolean to control open state of modal dialog externally */
-    open?: boolean;
-  }
->(function ModalDialog(props, ref): ReactElement {
-  const {
-    "data-testid": dataTestId,
-    accessibilityLabel,
-    children,
-    dismissable = true,
-    initialOpen,
-    onChangeContentVisibility,
-    open,
-  } = props;
-
-  return (
-    <RACModalOverlay
-      isDismissable={dismissable}
-      isKeyboardDismissDisabled={!dismissable}
-      defaultOpen={initialOpen}
-      isOpen={open}
-      className={styles.racModalOverlay}
-    >
-      {({ state }) => (
-        <Box
-          padding={4} // padding/gutter from window edges
-          height="100%"
-          width="100%"
-          display="flex"
-          direction="column"
-          alignItems="center"
-          justifyContent="center"
-        >
-          <RACModal
-            ref={ref}
-            aria-label={accessibilityLabel}
-            className={styles.racModal}
-          >
-            {({ isEntering, isExiting }) => (
-              <>
-                <OverlayVisibility
-                  isEntering={isEntering}
-                  isExiting={isExiting}
-                  onChange={onChangeContentVisibility}
-                />
-                <Dialog
-                  accessibilityLabel={accessibilityLabel}
-                  data-testid={dataTestId}
-                >
-                  <Box
-                    position="absolute"
-                    padding={2}
-                    dangerouslySetInlineStyle={{
-                      __style: {
-                        top: "0",
-                        right: "0",
-                      },
-                    }}
-                  >
-                    <IconButton
-                      onClick={() => state.close()}
-                      color="tertiary"
-                      // TODO(remove this comment before merge):
-                      //  internationalize? rac dialog already includes
-                      //  hidden dismiss element, accessible to screen readers,
-                      //  and that aria-label _is_ i18n'ed "dismiss"
-                      accessibilityLabel="Dismiss"
-                      icon={XIcon}
-                    />
-                  </Box>
-                  {children}
-                </Dialog>
-              </>
-            )}
-          </RACModal>
-        </Box>
-      )}
-    </RACModalOverlay>
-  );
-});
-
-export { ModalDialog };