diff --git a/web/roles/delete-role-modal.css b/web/roles/delete-role-modal.css
new file mode 100644
--- /dev/null
+++ b/web/roles/delete-role-modal.css
@@ -0,0 +1,20 @@
+.roleDeletionText {
+  color: var(--modal-fg);
+  font-size: var(--m-font-14);
+  padding: 16px 32px;
+}
+
+.buttonsContainer {
+  display: flex;
+  flex-direction: row;
+  justify-content: flex-end;
+  padding: 16px 32px;
+}
+
+.cancelButton {
+  width: 100px;
+}
+
+.deleteRoleButton {
+  margin-left: 8px;
+}
diff --git a/web/roles/delete-role-modal.react.js b/web/roles/delete-role-modal.react.js
new file mode 100644
--- /dev/null
+++ b/web/roles/delete-role-modal.react.js
@@ -0,0 +1,94 @@
+// @flow
+
+import * as React from 'react';
+
+import {
+  deleteCommunityRole,
+  deleteCommunityRoleActionTypes,
+} from 'lib/actions/thread-actions.js';
+import { useModalContext } from 'lib/components/modal-provider.react.js';
+import { useRoleMemberCountsForCommunity } from 'lib/shared/thread-utils.js';
+import type { ThreadInfo } from 'lib/types/thread-types.js';
+import {
+  useServerCall,
+  useDispatchActionPromise,
+} from 'lib/utils/action-utils.js';
+
+import css from './delete-role-modal.css';
+import Button, { buttonThemes } from '../components/button.react.js';
+import Modal from '../modals/modal.react.js';
+
+type DeleteRoleModalProps = {
+  +threadInfo: ThreadInfo,
+  +defaultRoleID: string,
+  +roleID: string,
+};
+
+function DeleteRoleModal(props: DeleteRoleModalProps): React.Node {
+  const { threadInfo, defaultRoleID, roleID } = props;
+  const { popModal } = useModalContext();
+
+  const callDeleteCommunityRole = useServerCall(deleteCommunityRole);
+  const dispatchActionPromise = useDispatchActionPromise();
+
+  const roleNamesToMemberCounts = useRoleMemberCountsForCommunity(threadInfo);
+  const roleName = threadInfo.roles[roleID].name;
+  const memberCount = roleNamesToMemberCounts[roleName];
+  const defaultRoleName = threadInfo.roles[defaultRoleID].name;
+
+  let message;
+  if (memberCount === 0) {
+    message = 'Are you sure you want to delete this role?';
+  } else {
+    const messageNoun = memberCount === 1 ? 'member' : 'members';
+    const messageVerb = memberCount === 1 ? 'is' : 'are';
+
+    message =
+      `There ${messageVerb} currently ${memberCount} ${messageNoun} with ` +
+      `this role. Deleting this role will automatically assign the members ` +
+      `affected to the ${defaultRoleName} role.`;
+  }
+
+  const onDeleteRole = React.useCallback(() => {
+    dispatchActionPromise(
+      deleteCommunityRoleActionTypes,
+      callDeleteCommunityRole({
+        community: threadInfo.id,
+        roleID: roleID,
+      }),
+    );
+    popModal();
+  }, [
+    callDeleteCommunityRole,
+    dispatchActionPromise,
+    roleID,
+    threadInfo.id,
+    popModal,
+  ]);
+
+  return (
+    <Modal name="Delete role" onClose={popModal} size="large">
+      <div className={css.roleDeletionText}>{message}</div>
+      <div className={css.buttonsContainer}>
+        <Button
+          variant="outline"
+          className={css.cancelButton}
+          buttonColor={buttonThemes.outline}
+          onClick={popModal}
+        >
+          Cancel
+        </Button>
+        <Button
+          variant="filled"
+          className={css.deleteRoleButton}
+          buttonColor={buttonThemes.danger}
+          onClick={onDeleteRole}
+        >
+          Yes, delete role
+        </Button>
+      </div>
+    </Modal>
+  );
+}
+
+export default DeleteRoleModal;
diff --git a/web/roles/role-actions-menu.react.js b/web/roles/role-actions-menu.react.js
--- a/web/roles/role-actions-menu.react.js
+++ b/web/roles/role-actions-menu.react.js
@@ -1,5 +1,6 @@
 // @flow
 
+import invariant from 'invariant';
 import * as React from 'react';
 
 import { useModalContext } from 'lib/components/modal-provider.react.js';
@@ -8,6 +9,7 @@
 import type { ThreadInfo } from 'lib/types/thread-types.js';
 
 import CreateRolesModal from './create-roles-modal.react.js';
+import DeleteRoleModal from './delete-role-modal.react.js';
 import css from './role-actions-menu.css';
 import MenuItem from '../components/menu-item.react.js';
 import Menu from '../components/menu.react.js';
@@ -26,9 +28,11 @@
   const defaultRoleID = Object.keys(threadInfo.roles).find(
     roleID => threadInfo.roles[roleID].isDefault,
   );
+  invariant(defaultRoleID, 'id should exist for default role');
   const existingRoleID = Object.keys(threadInfo.roles).find(
     roleID => threadInfo.roles[roleID].name === roleName,
   );
+  invariant(existingRoleID, 'id should exist for an existing role');
 
   const isDeletableRole =
     roleName !== 'Admins' && defaultRoleID !== existingRoleID;
@@ -56,7 +60,15 @@
       threadInfo,
     ],
   );
-  const openDeleteRoleModal = React.useCallback(() => {}, []);
+  const openDeleteRoleModal = React.useCallback(() => {
+    pushModal(
+      <DeleteRoleModal
+        threadInfo={threadInfo}
+        defaultRoleID={defaultRoleID}
+        roleID={existingRoleID}
+      />,
+    );
+  }, [existingRoleID, pushModal, threadInfo, defaultRoleID]);
 
   const items = React.useMemo(() => {
     const availableOptions = [];