diff --git a/lib/shared/relationship-utils.js b/lib/shared/relationship-utils.js
--- a/lib/shared/relationship-utils.js
+++ b/lib/shared/relationship-utils.js
@@ -46,7 +46,7 @@
 }
 
 function relationshipBlockedInEitherDirection(
-  relationshipStatus: UserRelationshipStatus,
+  relationshipStatus: ?UserRelationshipStatus,
 ): boolean {
   return (
     relationshipStatus === userRelationshipStatus.BLOCKED_VIEWER ||
diff --git a/native/components/user-profile-message-button.react.js b/native/components/user-profile-message-button.react.js
new file mode 100644
--- /dev/null
+++ b/native/components/user-profile-message-button.react.js
@@ -0,0 +1,69 @@
+// @flow
+
+import { useBottomSheetModal } from '@gorhom/bottom-sheet';
+import * as React from 'react';
+import { Text } from 'react-native';
+
+import type { ThreadInfo } from 'lib/types/thread-types.js';
+import type { UserInfo } from 'lib/types/user-types';
+
+import Button from './button.react.js';
+import SWMansionIcon from './swmansion-icon.react.js';
+import { useNavigateToThread } from '../chat/message-list-types.js';
+import { useStyles } from '../themes/colors.js';
+
+type Props = {
+  +threadInfo: ThreadInfo,
+  +pendingPersonalThreadUserInfo?: UserInfo,
+};
+
+function UserProfileMessageButton(props: Props): React.Node {
+  const { threadInfo, pendingPersonalThreadUserInfo } = props;
+
+  const { dismiss: dismissBottomSheetModal } = useBottomSheetModal();
+
+  const styles = useStyles(unboundStyles);
+
+  const navigateToThread = useNavigateToThread();
+
+  const onPressMessage = React.useCallback(() => {
+    dismissBottomSheetModal();
+    navigateToThread({
+      threadInfo,
+      pendingPersonalThreadUserInfo,
+    });
+  }, [
+    dismissBottomSheetModal,
+    navigateToThread,
+    pendingPersonalThreadUserInfo,
+    threadInfo,
+  ]);
+
+  return (
+    <Button style={styles.messageButtonContainer} onPress={onPressMessage}>
+      <SWMansionIcon name="send-2" size={22} style={styles.messageButtonIcon} />
+      <Text style={styles.messageButtonText}>Message</Text>
+    </Button>
+  );
+}
+
+const unboundStyles = {
+  messageButtonContainer: {
+    flexDirection: 'row',
+    justifyContent: 'center',
+    alignItems: 'center',
+    backgroundColor: 'purpleButton',
+    paddingVertical: 8,
+    marginTop: 16,
+    borderRadius: 8,
+  },
+  messageButtonIcon: {
+    color: 'floatingButtonLabel',
+    paddingRight: 8,
+  },
+  messageButtonText: {
+    color: 'floatingButtonLabel',
+  },
+};
+
+export default UserProfileMessageButton;
diff --git a/native/components/user-profile.react.js b/native/components/user-profile.react.js
--- a/native/components/user-profile.react.js
+++ b/native/components/user-profile.react.js
@@ -4,11 +4,14 @@
 import * as React from 'react';
 import { View, Text, TouchableOpacity } from 'react-native';
 
+import { relationshipBlockedInEitherDirection } from 'lib/shared/relationship-utils.js';
+import { useUserProfileThreadInfo } from 'lib/shared/thread-utils.js';
 import { stringForUserExplicit } from 'lib/shared/user-utils.js';
 import type { UserInfo } from 'lib/types/user-types';
 import sleep from 'lib/utils/sleep.js';
 
 import SWMansionIcon from './swmansion-icon.react.js';
+import UserProfileMessageButton from './user-profile-message-button.react.js';
 import UserAvatar from '../avatars/user-avatar.react.js';
 import SingleLine from '../components/single-line.react.js';
 import { useStyles } from '../themes/colors.js';
@@ -20,6 +23,8 @@
 function UserProfile(props: Props): React.Node {
   const { userInfo } = props;
 
+  const userProfileThreadInfo = useUserProfileThreadInfo(userInfo);
+
   const usernameText = stringForUserExplicit(userInfo);
 
   const [usernameCopied, setUsernameCopied] = React.useState<boolean>(false);
@@ -64,6 +69,23 @@
     usernameCopied,
   ]);
 
+  const messageButton = React.useMemo(() => {
+    if (
+      !userProfileThreadInfo ||
+      relationshipBlockedInEitherDirection(userInfo?.relationshipStatus)
+    ) {
+      return null;
+    }
+
+    const { threadInfo, pendingPersonalThreadUserInfo } = userProfileThreadInfo;
+    return (
+      <UserProfileMessageButton
+        threadInfo={threadInfo}
+        pendingPersonalThreadUserInfo={pendingPersonalThreadUserInfo}
+      />
+    );
+  }, [userInfo?.relationshipStatus, userProfileThreadInfo]);
+
   return (
     <View style={styles.container}>
       <SWMansionIcon name="menu-vertical" size={24} style={styles.moreIcon} />
@@ -74,6 +96,7 @@
           {copyUsernameButton}
         </View>
       </View>
+      {messageButton}
     </View>
   );
 }
@@ -113,6 +136,22 @@
     color: 'purpleLink',
     fontSize: 12,
   },
+  messageButtonContainer: {
+    flexDirection: 'row',
+    justifyContent: 'center',
+    alignItems: 'center',
+    backgroundColor: 'purpleButton',
+    paddingVertical: 8,
+    marginTop: 16,
+    borderRadius: 8,
+  },
+  messageButtonIcon: {
+    color: 'floatingButtonLabel',
+    paddingRight: 8,
+  },
+  messageButtonText: {
+    color: 'floatingButtonLabel',
+  },
 };
 
 export default UserProfile;