diff --git a/RESOURCES/FEATURE_FLAGS.md b/RESOURCES/FEATURE_FLAGS.md
index 1143f93a7..6e6bf16e5 100644
--- a/RESOURCES/FEATURE_FLAGS.md
+++ b/RESOURCES/FEATURE_FLAGS.md
@@ -93,7 +93,4 @@ These features flags currently default to True and **will be removed in a future
 
 [//]: # "PLEASE KEEP THE LIST SORTED ALPHABETICALLY"
 
-- ALLOW_DASHBOARD_DOMAIN_SHARDING
-- DISPLAY_MARKDOWN_HTML
-- FORCE_DATABASE_CONNECTIONS_SSL
 - GENERIC_CHART_AXES
diff --git a/UPDATING.md b/UPDATING.md
index f502c6497..9afd8d353 100644
--- a/UPDATING.md
+++ b/UPDATING.md
@@ -49,6 +49,7 @@ assists people when migrating to a new version.
 ### Breaking Changes
 
 - [23651](https://github.com/apache/superset/pull/23651) Removes UX_BETA feature flag.
+- [23663](https://github.com/apache/superset/pull/23663) Removes deprecated feature flags `ALLOW_DASHBOARD_DOMAIN_SHARDING`, `DISPLAY_MARKDOWN_HTML`, and `FORCE_DATABASE_CONNECTIONS_SSL`.
 - [22798](https://github.com/apache/superset/pull/22798): To make the welcome page more relevant in production environments, the last tab on the welcome page has been changed from to feature all charts/dashboards the user has access to (previously only examples were shown). To keep current behavior unchanged, add the following to your `superset_config.py`: `WELCOME_PAGE_LAST_TAB = "examples"`
 - [22328](https://github.com/apache/superset/pull/22328): For deployments that have enabled the "THUMBNAILS" feature flag, the function that calculates dashboard digests has been updated to consider additional properties to more accurately identify changes in the dashboard metadata. This change will invalidate all currently cached dashboard thumbnails.
 - [21765](https://github.com/apache/superset/pull/21765): For deployments that have enabled the "ALERT_REPORTS" feature flag, Gamma users will no longer have read and write access to Alerts & Reports by default. To give Gamma users the ability to schedule reports from the Dashboard and Explore view like before, create an additional role with "can read on ReportSchedule" and "can write on ReportSchedule" permissions. To further give Gamma users access to the "Alerts & Reports" menu and CRUD view, add "menu access on Manage" and "menu access on Alerts & Report" permissions to the role.
diff --git a/superset-frontend/packages/superset-ui-core/src/components/SafeMarkdown.tsx b/superset-frontend/packages/superset-ui-core/src/components/SafeMarkdown.tsx
index 929db60b0..b0826ce2e 100644
--- a/superset-frontend/packages/superset-ui-core/src/components/SafeMarkdown.tsx
+++ b/superset-frontend/packages/superset-ui-core/src/components/SafeMarkdown.tsx
@@ -44,12 +44,11 @@ function SafeMarkdown({
   htmlSanitization = true,
   htmlSchemaOverrides = {},
 }: SafeMarkdownProps) {
-  const displayHtml = isFeatureEnabled(FeatureFlag.DISPLAY_MARKDOWN_HTML);
   const escapeHtml = isFeatureEnabled(FeatureFlag.ESCAPE_MARKDOWN_HTML);
 
   const rehypePlugins = useMemo(() => {
     const rehypePlugins: any = [];
-    if (displayHtml && !escapeHtml) {
+    if (!escapeHtml) {
       rehypePlugins.push(rehypeRaw);
       if (htmlSanitization) {
         const schema = getOverrideHtmlSchema(
@@ -60,14 +59,14 @@ function SafeMarkdown({
       }
     }
     return rehypePlugins;
-  }, [displayHtml, escapeHtml, htmlSanitization, htmlSchemaOverrides]);
+  }, [escapeHtml, htmlSanitization, htmlSchemaOverrides]);
 
   // React Markdown escapes HTML by default
   return (
     <ReactMarkdown
       rehypePlugins={rehypePlugins}
       remarkPlugins={[remarkGfm]}
-      skipHtml={!displayHtml}
+      skipHtml={false}
     >
       {source}
     </ReactMarkdown>
diff --git a/superset-frontend/packages/superset-ui-core/src/utils/featureFlags.ts b/superset-frontend/packages/superset-ui-core/src/utils/featureFlags.ts
index 21e0ec279..2627a4236 100644
--- a/superset-frontend/packages/superset-ui-core/src/utils/featureFlags.ts
+++ b/superset-frontend/packages/superset-ui-core/src/utils/featureFlags.ts
@@ -22,7 +22,6 @@ export enum FeatureFlag {
   // PLEASE KEEP THE LIST SORTED ALPHABETICALLY
   ALERTS_ATTACH_REPORTS = 'ALERTS_ATTACH_REPORTS',
   ALERT_REPORTS = 'ALERT_REPORTS',
-  ALLOW_DASHBOARD_DOMAIN_SHARDING = 'ALLOW_DASHBOARD_DOMAIN_SHARDING',
   ALLOW_FULL_CSV_EXPORT = 'ALLOW_FULL_CSV_EXPORT',
   CLIENT_CACHE = 'CLIENT_CACHE',
   DASHBOARD_CROSS_FILTERS = 'DASHBOARD_CROSS_FILTERS',
@@ -36,7 +35,6 @@ export enum FeatureFlag {
   DATAPANEL_CLOSED_BY_DEFAULT = 'DATAPANEL_CLOSED_BY_DEFAULT',
   DISABLE_DATASET_SOURCE_EDIT = 'DISABLE_DATASET_SOURCE_EDIT',
   DISABLE_LEGACY_DATASOURCE_EDITOR = 'DISABLE_LEGACY_DATASOURCE_EDITOR',
-  DISPLAY_MARKDOWN_HTML = 'DISPLAY_MARKDOWN_HTML',
   DRILL_TO_DETAIL = 'DRILL_TO_DETAIL',
   DRILL_BY = 'DRILL_BY',
   DYNAMIC_PLUGINS = 'DYNAMIC_PLUGINS',
@@ -50,7 +48,6 @@ export enum FeatureFlag {
   ENABLE_TEMPLATE_REMOVE_FILTERS = 'ENABLE_TEMPLATE_REMOVE_FILTERS',
   ESCAPE_MARKDOWN_HTML = 'ESCAPE_MARKDOWN_HTML',
   ESTIMATE_QUERY_COST = 'ESTIMATE_QUERY_COST',
-  FORCE_DATABASE_CONNECTIONS_SSL = 'FORCE_DATABASE_CONNECTIONS_SSL',
   GENERIC_CHART_AXES = 'GENERIC_CHART_AXES',
   GLOBAL_ASYNC_QUERIES = 'GLOBAL_ASYNC_QUERIES',
   HORIZONTAL_FILTER_BAR = 'HORIZONTAL_FILTER_BAR',
diff --git a/superset-frontend/packages/superset-ui-core/test/utils/featureFlag.test.ts b/superset-frontend/packages/superset-ui-core/test/utils/featureFlag.test.ts
index 66c58e79a..ef6e0c372 100644
--- a/superset-frontend/packages/superset-ui-core/test/utils/featureFlag.test.ts
+++ b/superset-frontend/packages/superset-ui-core/test/utils/featureFlag.test.ts
@@ -25,13 +25,11 @@ it('returns false and raises console error if feature flags have not been initia
     value: undefined,
   });
 
-  expect(isFeatureEnabled(FeatureFlag.ALLOW_DASHBOARD_DOMAIN_SHARDING)).toEqual(
-    false,
-  );
+  expect(isFeatureEnabled(FeatureFlag.DRILL_BY)).toEqual(false);
   expect(console.error).toHaveBeenCalled();
   // @ts-expect-error
   expect(console.error.mock.calls[0][0]).toEqual(
-    'Failed to query feature flag ALLOW_DASHBOARD_DOMAIN_SHARDING',
+    'Failed to query feature flag DRILL_BY',
   );
 });
 
@@ -40,9 +38,7 @@ it('returns false for unset feature flag', () => {
     value: {},
   });
 
-  expect(isFeatureEnabled(FeatureFlag.ALLOW_DASHBOARD_DOMAIN_SHARDING)).toEqual(
-    false,
-  );
+  expect(isFeatureEnabled(FeatureFlag.DRILL_BY)).toEqual(false);
 });
 
 it('returns true for set feature flag', () => {
diff --git a/superset-frontend/src/features/databases/DatabaseModal/index.tsx b/superset-frontend/src/features/databases/DatabaseModal/index.tsx
index a14a851b6..4a8061236 100644
--- a/superset-frontend/src/features/databases/DatabaseModal/index.tsx
+++ b/superset-frontend/src/features/databases/DatabaseModal/index.tsx
@@ -588,9 +588,6 @@ const DatabaseModal: FunctionComponent<DatabaseModalProps> = ({
   const dbImages = getDatabaseImages();
   const connectionAlert = getConnectionAlert();
   const isEditMode = !!databaseId;
-  const sslForced = isFeatureEnabled(
-    FeatureFlag.FORCE_DATABASE_CONNECTIONS_SSL,
-  );
   const disableSSHTunnelingForEngine = (
     availableDbs?.databases?.find(
       (DB: DatabaseObject) =>
@@ -1537,7 +1534,7 @@ const DatabaseModal: FunctionComponent<DatabaseModalProps> = ({
       <DatabaseConnectionForm
         isEditMode={isEditMode}
         db={db as DatabaseObject}
-        sslForced={sslForced}
+        sslForced={false}
         dbModel={dbModel}
         onAddTableCatalog={() => {
           setDB({ type: ActionType.addTableCatalogSheet });
diff --git a/superset-frontend/src/utils/hostNamesConfig.js b/superset-frontend/src/utils/hostNamesConfig.js
index eabc3b64e..dfbf9b26c 100644
--- a/superset-frontend/src/utils/hostNamesConfig.js
+++ b/superset-frontend/src/utils/hostNamesConfig.js
@@ -16,8 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-import { FeatureFlag } from '@superset-ui/core';
-import { initFeatureFlags, isFeatureEnabled } from 'src/featureFlags';
+import { initFeatureFlags } from 'src/featureFlags';
 import getBootstrapData from './getBootstrapData';
 
 function getDomainsConfig() {
@@ -43,7 +42,6 @@ function getDomainsConfig() {
   initFeatureFlags(bootstrapData.common.feature_flags);
 
   if (
-    isFeatureEnabled(FeatureFlag.ALLOW_DASHBOARD_DOMAIN_SHARDING) &&
     bootstrapData &&
     bootstrapData.common &&
     bootstrapData.common.conf &&
diff --git a/superset/config.py b/superset/config.py
index 04e6b48b4..8baf177ba 100644
--- a/superset/config.py
+++ b/superset/config.py
@@ -386,10 +386,6 @@ LANGUAGES = {}
 # and FEATURE_FLAGS = { 'BAR': True, 'BAZ': True } in superset_config.py
 # will result in combined feature flags of { 'FOO': True, 'BAR': True, 'BAZ': True }
 DEFAULT_FEATURE_FLAGS: Dict[str, bool] = {
-    # allow dashboard to use sub-domains to send chart request
-    # you also need ENABLE_CORS and
-    # SUPERSET_WEBSERVER_DOMAINS for list of domains
-    "ALLOW_DASHBOARD_DOMAIN_SHARDING": True,
     # Experimental feature introducing a client (browser) cache
     "CLIENT_CACHE": False,
     "DISABLE_DATASET_SOURCE_EDIT": False,
@@ -428,8 +424,6 @@ DEFAULT_FEATURE_FLAGS: Dict[str, bool] = {
     "TAGGING_SYSTEM": False,
     "SQLLAB_BACKEND_PERSISTENCE": True,
     "LISTVIEWS_DEFAULT_CARD_VIEW": False,
-    # When True, this flag allows display of HTML tags in Markdown components
-    "DISPLAY_MARKDOWN_HTML": True,
     # When True, this escapes HTML (rather than rendering it) in Markdown components
     "ESCAPE_MARKDOWN_HTML": False,
     "DASHBOARD_NATIVE_FILTERS": True,
@@ -454,8 +448,6 @@ DEFAULT_FEATURE_FLAGS: Dict[str, bool] = {
     # for report with type 'report' still send with email and slack message with
     # screenshot and link
     "ALERTS_ATTACH_REPORTS": True,
-    # FORCE_DATABASE_CONNECTIONS_SSL is depreciated.
-    "FORCE_DATABASE_CONNECTIONS_SSL": False,
     # Allow users to export full CSV of table viz type.
     # This could cause the server to run out of memory or compute.
     "ALLOW_FULL_CSV_EXPORT": False,