diff --git a/docs/pages/api-docs/snackbar-content.json b/docs/pages/api-docs/snackbar-content.json
index 828dae95f1e393..91ead472f9b81d 100644
--- a/docs/pages/api-docs/snackbar-content.json
+++ b/docs/pages/api-docs/snackbar-content.json
@@ -3,7 +3,8 @@
     "action": { "type": { "name": "node" } },
     "classes": { "type": { "name": "object" } },
     "message": { "type": { "name": "node" } },
-    "role": { "type": { "name": "string" }, "default": "'alert'" }
+    "role": { "type": { "name": "string" }, "default": "'alert'" },
+    "sx": { "type": { "name": "object" } }
   },
   "name": "SnackbarContent",
   "styles": {
@@ -16,6 +17,6 @@
   "filename": "/packages/material-ui/src/SnackbarContent/SnackbarContent.js",
   "inheritance": { "component": "Paper", "pathname": "/api/paper/" },
   "demos": "<ul><li><a href=\"/components/snackbars/\">Snackbars</a></li></ul>",
-  "styledComponent": false,
+  "styledComponent": true,
   "cssComponent": false
 }
diff --git a/docs/translations/api-docs/snackbar-content/snackbar-content.json b/docs/translations/api-docs/snackbar-content/snackbar-content.json
index ed06fd15c166ae..f9063db926c169 100644
--- a/docs/translations/api-docs/snackbar-content/snackbar-content.json
+++ b/docs/translations/api-docs/snackbar-content/snackbar-content.json
@@ -4,7 +4,8 @@
     "action": "The action to display. It renders after the message, at the end of the snackbar.",
     "classes": "Override or extend the styles applied to the component. See <a href=\"#css\">CSS API</a> below for more details.",
     "message": "The message to display.",
-    "role": "The ARIA role attribute of the element."
+    "role": "The ARIA role attribute of the element.",
+    "sx": "The system prop that allows defining system overrides as well as additional CSS styles. See the <a href=\"/system/basics/#the-sx-prop\">`sx` page</a> for more details."
   },
   "classDescriptions": {
     "root": { "description": "Styles applied to the root element." },
diff --git a/framer/scripts/framerConfig.js b/framer/scripts/framerConfig.js
index ddba979c610c9b..852a8a0136e2cf 100644
--- a/framer/scripts/framerConfig.js
+++ b/framer/scripts/framerConfig.js
@@ -292,7 +292,7 @@ export const componentSettings = {
     template: 'slider.txt',
   },
   SnackbarContent: {
-    ignoredProps: ['action', 'role'],
+    ignoredProps: ['action', 'role', 'sx'],
     propValues: {
       width: 568,
       height: 48,
diff --git a/packages/material-ui/src/AccordionDetails/AccordionDetails.js b/packages/material-ui/src/AccordionDetails/AccordionDetails.js
index d345b4ffbe6974..180eb636cb7628 100644
--- a/packages/material-ui/src/AccordionDetails/AccordionDetails.js
+++ b/packages/material-ui/src/AccordionDetails/AccordionDetails.js
@@ -36,6 +36,7 @@ const AccordionDetailsRoot = experimentalStyled(
 const AccordionDetails = React.forwardRef(function AccordionDetails(inProps, ref) {
   const props = useThemeProps({ props: inProps, name: 'MuiAccordionDetails' });
   const { className, ...other } = props;
+  // TODO: convert to simple assignment after the type error in defaultPropsHandler.js:60:6 is fixed
   const styleProps = { ...props };
 
   const classes = useUtilityClasses(styleProps);
diff --git a/packages/material-ui/src/SnackbarContent/SnackbarContent.d.ts b/packages/material-ui/src/SnackbarContent/SnackbarContent.d.ts
index 32eb0509a7904e..1ab4c7c092b144 100644
--- a/packages/material-ui/src/SnackbarContent/SnackbarContent.d.ts
+++ b/packages/material-ui/src/SnackbarContent/SnackbarContent.d.ts
@@ -1,4 +1,6 @@
 import * as React from 'react';
+import { SxProps } from '@material-ui/system';
+import { Theme } from '../styles';
 import { InternalStandardProps as StandardProps } from '..';
 import { PaperProps } from '../Paper';
 
@@ -27,6 +29,10 @@ export interface SnackbarContentProps extends StandardProps<PaperProps, 'childre
    * @default 'alert'
    */
   role?: PaperProps['role'];
+  /**
+   * The system prop that allows defining system overrides as well as additional CSS styles.
+   */
+  sx?: SxProps<Theme>;
 }
 
 export type SnackbarContentClassKey = keyof NonNullable<SnackbarContentProps['classes']>;
diff --git a/packages/material-ui/src/SnackbarContent/SnackbarContent.js b/packages/material-ui/src/SnackbarContent/SnackbarContent.js
index 94e819d4191bd1..0caa4d76419a9a 100644
--- a/packages/material-ui/src/SnackbarContent/SnackbarContent.js
+++ b/packages/material-ui/src/SnackbarContent/SnackbarContent.js
@@ -1,61 +1,114 @@
 import * as React from 'react';
 import PropTypes from 'prop-types';
 import clsx from 'clsx';
-import withStyles from '../styles/withStyles';
-import Paper from '../Paper';
+import { deepmerge } from '@material-ui/utils';
+import { unstable_composeClasses as composeClasses } from '@material-ui/unstyled';
+import experimentalStyled from '../styles/experimentalStyled';
+import useThemeProps from '../styles/useThemeProps';
 import { emphasize } from '../styles/colorManipulator';
+import Paper from '../Paper';
+import snackbarContentClasses, { getSnackbarContentUtilityClass } from './snackbarContentClasses';
+
+const overridesResolver = (props, styles) => {
+  return deepmerge(styles.root || {}, {
+    [`& .${snackbarContentClasses.action}`]: styles.action,
+    [`& .${snackbarContentClasses.message}`]: styles.message,
+  });
+};
+
+const useUtilityClasses = (styleProps) => {
+  const { classes } = styleProps;
 
-export const styles = (theme) => {
+  const slots = {
+    root: ['root'],
+    action: ['action'],
+    message: ['message'],
+  };
+
+  return composeClasses(slots, getSnackbarContentUtilityClass, classes);
+};
+
+const SnackbarContentRoot = experimentalStyled(
+  Paper,
+  {},
+  {
+    name: 'MuiSnackbarContent',
+    slot: 'Root',
+    overridesResolver,
+  },
+)(({ theme }) => {
   const emphasis = theme.palette.mode === 'light' ? 0.8 : 0.98;
   const backgroundColor = emphasize(theme.palette.background.default, emphasis);
 
   return {
-    /* Styles applied to the root element. */
-    root: {
-      ...theme.typography.body2,
-      color: theme.palette.getContrastText(backgroundColor),
-      backgroundColor,
-      display: 'flex',
-      alignItems: 'center',
-      flexWrap: 'wrap',
-      padding: '6px 16px',
-      borderRadius: theme.shape.borderRadius,
-      flexGrow: 1,
-      [theme.breakpoints.up('sm')]: {
-        flexGrow: 'initial',
-        minWidth: 288,
-      },
-    },
-    /* Styles applied to the message wrapper element. */
-    message: {
-      padding: '8px 0',
-    },
-    /* Styles applied to the action wrapper element if `action` is provided. */
-    action: {
-      display: 'flex',
-      alignItems: 'center',
-      marginLeft: 'auto',
-      paddingLeft: 16,
-      marginRight: -8,
+    ...theme.typography.body2,
+    color: theme.palette.getContrastText(backgroundColor),
+    backgroundColor,
+    display: 'flex',
+    alignItems: 'center',
+    flexWrap: 'wrap',
+    padding: '6px 16px',
+    borderRadius: theme.shape.borderRadius,
+    flexGrow: 1,
+    [theme.breakpoints.up('sm')]: {
+      flexGrow: 'initial',
+      minWidth: 288,
     },
   };
-};
+});
 
-const SnackbarContent = React.forwardRef(function SnackbarContent(props, ref) {
-  const { action, classes, className, message, role = 'alert', ...other } = props;
+const SnackbarContentMessage = experimentalStyled(
+  'div',
+  {},
+  {
+    name: 'MuiSnackbarContent',
+    slot: 'Message',
+  },
+)({
+  padding: '8px 0',
+});
+
+const SnackbarContentAction = experimentalStyled(
+  'div',
+  {},
+  {
+    name: 'MuiSnackbarContent',
+    slot: 'Action',
+  },
+)({
+  display: 'flex',
+  alignItems: 'center',
+  marginLeft: 'auto',
+  paddingLeft: 16,
+  marginRight: -8,
+});
+
+const SnackbarContent = React.forwardRef(function SnackbarContent(inProps, ref) {
+  const props = useThemeProps({ props: inProps, name: 'MuiSnackbarContent' });
+  const { action, className, message, role = 'alert', ...other } = props;
+  // TODO: convert to simple assignment after the type error in defaultPropsHandler.js:60:6 is fixed
+  const styleProps = { ...props };
+  const classes = useUtilityClasses(styleProps);
 
   return (
-    <Paper
+    <SnackbarContentRoot
       role={role}
       square
       elevation={6}
       className={clsx(classes.root, className)}
+      styleProps={styleProps}
       ref={ref}
       {...other}
     >
-      <div className={classes.message}>{message}</div>
-      {action ? <div className={classes.action}>{action}</div> : null}
-    </Paper>
+      <SnackbarContentMessage className={classes.message} styleProps={styleProps}>
+        {message}
+      </SnackbarContentMessage>
+      {action ? (
+        <SnackbarContentAction className={classes.action} styleProps={styleProps}>
+          {action}
+        </SnackbarContentAction>
+      ) : null}
+    </SnackbarContentRoot>
   );
 });
 
@@ -85,6 +138,10 @@ SnackbarContent.propTypes = {
    * @default 'alert'
    */
   role: PropTypes.string,
+  /**
+   * The system prop that allows defining system overrides as well as additional CSS styles.
+   */
+  sx: PropTypes.object,
 };
 
-export default withStyles(styles, { name: 'MuiSnackbarContent' })(SnackbarContent);
+export default SnackbarContent;
diff --git a/packages/material-ui/src/SnackbarContent/SnackbarContent.test.js b/packages/material-ui/src/SnackbarContent/SnackbarContent.test.js
index b3cd8de9c0fb49..cba0be526fe1c5 100644
--- a/packages/material-ui/src/SnackbarContent/SnackbarContent.test.js
+++ b/packages/material-ui/src/SnackbarContent/SnackbarContent.test.js
@@ -1,24 +1,22 @@
 import * as React from 'react';
 import { expect } from 'chai';
-import { createClientRender, getClasses, createMount, describeConformance } from 'test/utils';
+import { createClientRender, createMount, describeConformanceV5 } from 'test/utils';
 import Paper from '../Paper';
+import classes from './snackbarContentClasses';
 import SnackbarContent from './SnackbarContent';
 
 describe('<SnackbarContent />', () => {
-  const mount = createMount();
-  let classes;
   const render = createClientRender();
+  const mount = createMount();
 
-  before(() => {
-    classes = getClasses(<SnackbarContent message="message" />);
-  });
-
-  describeConformance(<SnackbarContent message="conform?" />, () => ({
+  describeConformanceV5(<SnackbarContent message="conform?" />, () => ({
     classes,
     inheritComponent: Paper,
+    render,
     mount,
+    muiName: 'MuiSnackbarContent',
     refInstanceof: window.HTMLDivElement,
-    skip: ['componentProp'],
+    skip: ['componentProp', 'componentsProp', 'themeVariants'],
   }));
 
   describe('prop: action', () => {
diff --git a/packages/material-ui/src/SnackbarContent/index.d.ts b/packages/material-ui/src/SnackbarContent/index.d.ts
index ab4fa3bdecb3bd..658d42f88a58ea 100644
--- a/packages/material-ui/src/SnackbarContent/index.d.ts
+++ b/packages/material-ui/src/SnackbarContent/index.d.ts
@@ -1,2 +1,5 @@
 export { default } from './SnackbarContent';
 export * from './SnackbarContent';
+
+export { default as snackbarContentClasses } from './snackbarContentClasses';
+export * from './snackbarContentClasses';
diff --git a/packages/material-ui/src/SnackbarContent/index.js b/packages/material-ui/src/SnackbarContent/index.js
index 4f9b0215d76545..44f55061a70824 100644
--- a/packages/material-ui/src/SnackbarContent/index.js
+++ b/packages/material-ui/src/SnackbarContent/index.js
@@ -1 +1,4 @@
 export { default } from './SnackbarContent';
+
+export { default as snackbarContentClasses } from './snackbarContentClasses';
+export * from './snackbarContentClasses';
diff --git a/packages/material-ui/src/SnackbarContent/snackbarContentClasses.d.ts b/packages/material-ui/src/SnackbarContent/snackbarContentClasses.d.ts
new file mode 100644
index 00000000000000..30040f3e561412
--- /dev/null
+++ b/packages/material-ui/src/SnackbarContent/snackbarContentClasses.d.ts
@@ -0,0 +1,9 @@
+import { SnackbarContentClassKey } from './SnackbarContent';
+
+export type SnackbarContentClasses = Record<SnackbarContentClassKey, string>;
+
+declare const snackbarContentClasses: SnackbarContentClasses;
+
+export function getSnackbarContentUtilityClass(slot: string): string;
+
+export default snackbarContentClasses;
diff --git a/packages/material-ui/src/SnackbarContent/snackbarContentClasses.js b/packages/material-ui/src/SnackbarContent/snackbarContentClasses.js
new file mode 100644
index 00000000000000..3e082c46007793
--- /dev/null
+++ b/packages/material-ui/src/SnackbarContent/snackbarContentClasses.js
@@ -0,0 +1,13 @@
+import { generateUtilityClass, generateUtilityClasses } from '@material-ui/unstyled';
+
+export function getSnackbarContentUtilityClass(slot) {
+  return generateUtilityClass('MuiSnackbarContent', slot);
+}
+
+const snackbarContentClasses = generateUtilityClasses('MuiSnackbarContent', [
+  'root',
+  'message',
+  'action',
+]);
+
+export default snackbarContentClasses;