diff --git a/res/css/_components.scss b/res/css/_components.scss
index 4fb0eed4af..f29e30dcb4 100644
--- a/res/css/_components.scss
+++ b/res/css/_components.scss
@@ -70,6 +70,7 @@
 @import "./views/dialogs/_ShareDialog.scss";
 @import "./views/dialogs/_UnknownDeviceDialog.scss";
 @import "./views/dialogs/_UserSettingsDialog.scss";
+@import "./views/dialogs/_WidgetOpenIDPermissionsDialog.scss";
 @import "./views/dialogs/keybackup/_CreateKeyBackupDialog.scss";
 @import "./views/dialogs/keybackup/_KeyBackupFailedDialog.scss";
 @import "./views/dialogs/keybackup/_RestoreKeyBackupDialog.scss";
diff --git a/res/css/views/dialogs/_WidgetOpenIDPermissionsDialog.scss b/res/css/views/dialogs/_WidgetOpenIDPermissionsDialog.scss
new file mode 100644
index 0000000000..a419c105a9
--- /dev/null
+++ b/res/css/views/dialogs/_WidgetOpenIDPermissionsDialog.scss
@@ -0,0 +1,28 @@
+/*
+Copyright 2019 Travis Ralston
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_WidgetOpenIDPermissionsDialog .mx_SettingsFlag {
+    .mx_ToggleSwitch {
+        display: inline-block;
+        vertical-align: middle;
+        margin-right: 8px;
+    }
+
+    .mx_SettingsFlag_label {
+        display: inline-block;
+        vertical-align: middle;
+    }
+}
diff --git a/src/WidgetMessaging.js b/src/WidgetMessaging.js
index 17ce9360b7..dba703ffb8 100644
--- a/src/WidgetMessaging.js
+++ b/src/WidgetMessaging.js
@@ -26,6 +26,8 @@ import Modal from "./Modal";
 import QuestionDialog from "./components/views/dialogs/QuestionDialog";
 import {_t} from "./languageHandler";
 import MatrixClientPeg from "./MatrixClientPeg";
+import SettingsStore from "./settings/SettingsStore";
+import WidgetOpenIDPermissionsDialog from "./components/views/dialogs/WidgetOpenIDPermissionsDialog";
 
 if (!global.mxFromWidgetMessaging) {
     global.mxFromWidgetMessaging = new FromWidgetPostMessageApi();
@@ -123,40 +125,46 @@ export default class WidgetMessaging {
         this.fromWidget.removeListener("get_openid", this._openIdHandlerRef);
     }
 
-    _onOpenIdRequest(ev, rawEv) {
+    async _onOpenIdRequest(ev, rawEv) {
         if (ev.widgetId !== this.widgetId) return; // not interesting
 
+        const settings = SettingsStore.getValue("widgetOpenIDPermissions");
+        if (settings.blacklist && settings.blacklist.includes(this.widgetId)) {
+            this.fromWidget.sendResponse(rawEv, {state: "blocked"});
+            return;
+        }
+        if (settings.whitelist && settings.whitelist.includes(this.widgetId)) {
+            const responseBody = {state: "allowed"};
+            const credentials = await MatrixClientPeg.get().getOpenIdToken();
+            Object.assign(responseBody, credentials);
+            this.fromWidget.sendResponse(rawEv, responseBody);
+            return;
+        }
+
         // Confirm that we received the request
         this.fromWidget.sendResponse(rawEv, {state: "request"});
 
-        // TODO: Support blacklisting widgets
-        // TODO: Support whitelisting widgets
-
         // Actually ask for permission to send the user's data
-        Modal.createTrackedDialog("OpenID widget permissions", '', QuestionDialog, {
-            title: _t("A widget would like to verify your identity"),
-            description: _t(
-                "A widget located at %(widgetUrl)s would like to verify your identity. " +
-                "By allowing this, the widget will be able to verify your user ID, but not " +
-                "perform actions as you.", {
-                    widgetUrl: this.widgetUrl,
+        Modal.createTrackedDialog("OpenID widget permissions", '',
+            WidgetOpenIDPermissionsDialog, {
+                widgetUrl: this.widgetUrl,
+                widgetId: this.widgetId,
+
+                onFinished: async (confirm) => {
+                    const responseBody = {success: confirm};
+                    if (confirm) {
+                        const credentials = await MatrixClientPeg.get().getOpenIdToken();
+                        Object.assign(responseBody, credentials);
+                    }
+                    this.messageToWidget({
+                        api: OUTBOUND_API_NAME,
+                        action: "openid_credentials",
+                        data: responseBody,
+                    }).catch((error) => {
+                        console.error("Failed to send OpenID credentials: ", error);
+                    });
                 },
-            ),
-            button: _t("Allow"),
-            onFinished: async (confirm) => {
-                const responseBody = {success: confirm};
-                if (confirm) {
-                    const credentials = await MatrixClientPeg.get().getOpenIdToken();
-                    Object.assign(responseBody, credentials);
-                }
-                this.messageToWidget({
-                    api: OUTBOUND_API_NAME,
-                    action: "openid_credentials",
-                    data: responseBody,
-                }).catch((error) => {
-                    console.error("Failed to send OpenID credentials: ", error);
-                });
             },
-        });
+        );
     }
 }
diff --git a/src/components/views/dialogs/WidgetOpenIDPermissionsDialog.js b/src/components/views/dialogs/WidgetOpenIDPermissionsDialog.js
new file mode 100644
index 0000000000..bec71e49a3
--- /dev/null
+++ b/src/components/views/dialogs/WidgetOpenIDPermissionsDialog.js
@@ -0,0 +1,106 @@
+/*
+Copyright 2019 Travis Ralston
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import {Tab, TabbedView} from "../../structures/TabbedView";
+import {_t, _td} from "../../../languageHandler";
+import GeneralUserSettingsTab from "../settings/tabs/user/GeneralUserSettingsTab";
+import SettingsStore, {SettingLevel} from "../../../settings/SettingsStore";
+import LabsUserSettingsTab from "../settings/tabs/user/LabsUserSettingsTab";
+import SecurityUserSettingsTab from "../settings/tabs/user/SecurityUserSettingsTab";
+import NotificationUserSettingsTab from "../settings/tabs/user/NotificationUserSettingsTab";
+import PreferencesUserSettingsTab from "../settings/tabs/user/PreferencesUserSettingsTab";
+import VoiceUserSettingsTab from "../settings/tabs/user/VoiceUserSettingsTab";
+import HelpUserSettingsTab from "../settings/tabs/user/HelpUserSettingsTab";
+import FlairUserSettingsTab from "../settings/tabs/user/FlairUserSettingsTab";
+import sdk from "../../../index";
+import LabelledToggleSwitch from "../elements/LabelledToggleSwitch";
+
+export default class WidgetOpenIDPermissionsDialog extends React.Component {
+    static propTypes = {
+        onFinished: PropTypes.func.isRequired,
+        widgetUrl: PropTypes.string.isRequired,
+        widgetId: PropTypes.string.isRequired,
+    };
+
+    constructor() {
+        super();
+
+        this.state = {
+            rememberSelection: false,
+        };
+    }
+
+    _onAllow = () => {
+        this._onPermissionSelection(true);
+    };
+
+    _onDeny = () => {
+        this._onPermissionSelection(false);
+    };
+
+    _onPermissionSelection(allowed) {
+        if (this.state.rememberSelection) {
+            console.log(`Remembering ${this.props.widgetId} as allowed=${allowed} for OpenID`);
+
+            const currentValues = SettingsStore.getValue("widgetOpenIDPermissions");
+            if (!currentValues.whitelist) currentValues.whitelist = [];
+            if (!currentValues.blacklist) currentValues.blacklist = [];
+
+            (allowed ? currentValues.whitelist : currentValues.blacklist).push(this.props.widgetId);
+            SettingsStore.setValue("widgetOpenIDPermissions", null, SettingLevel.DEVICE, currentValues);
+        }
+
+        this.props.onFinished(allowed);
+    }
+
+    _onRememberSelectionChange = (newVal) => {
+        this.setState({rememberSelection: newVal});
+    };
+
+    render() {
+        const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
+        const DialogButtons = sdk.getComponent('views.elements.DialogButtons');
+
+        return (
+            <BaseDialog className='mx_WidgetOpenIDPermissionsDialog' hasCancel={true}
+                        onFinished={this.props.onFinished}
+                        title={_t("A widget would like to verify your identity")}>
+                <div className='mx_WidgetOpenIDPermissionsDialog_content'>
+                    <p>
+                        {_t(
+                            "A widget located at %(widgetUrl)s would like to verify your identity. " +
+                            "By allowing this, the widget will be able to verify your user ID, but not " +
+                            "perform actions as you.", {
+                                widgetUrl: this.props.widgetUrl,
+                            },
+                        )}
+                    </p>
+                    <LabelledToggleSwitch value={this.state.rememberSelection} toggleInFront={true}
+                                          onChange={this._onRememberSelectionChange}
+                                          label={_t("Remember my selection for this widget")} />
+                </div>
+                <DialogButtons
+                    primaryButton={_t("Allow")}
+                    onPrimaryButtonClick={this._onAllow}
+                    cancelButton={_t("Deny")}
+                    onCancel={this._onDeny}
+                />
+            </BaseDialog>
+        );
+    }
+}
diff --git a/src/components/views/elements/LabelledToggleSwitch.js b/src/components/views/elements/LabelledToggleSwitch.js
index 292c978e88..0cb9b224cf 100644
--- a/src/components/views/elements/LabelledToggleSwitch.js
+++ b/src/components/views/elements/LabelledToggleSwitch.js
@@ -31,15 +31,29 @@ export default class LabelledToggleSwitch extends React.Component {
 
         // Whether or not to disable the toggle switch
         disabled: PropTypes.bool,
+
+        // True to put the toggle in front of the label
+        // Default false.
+        toggleInFront: PropTypes.bool,
     };
 
     render() {
         // This is a minimal version of a SettingsFlag
+
+        let firstPart = <span className="mx_SettingsFlag_label">{this.props.label}</span>;
+        let secondPart = <ToggleSwitch checked={this.props.value} disabled={this.props.disabled}
+                                         onChange={this.props.onChange} />;
+
+        if (this.props.toggleInFront) {
+            const temp = firstPart;
+            firstPart = secondPart;
+            secondPart = temp;
+        }
+
         return (
             <div className="mx_SettingsFlag">
-                <span className="mx_SettingsFlag_label">{this.props.label}</span>
-                <ToggleSwitch checked={this.props.value} disabled={this.props.disabled}
-                              onChange={this.props.onChange} />
+                {firstPart}
+                {secondPart}
             </div>
         );
     }
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 21ad35a44c..4322d6cf7b 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -230,9 +230,6 @@
     "%(names)s and %(count)s others are typing …|other": "%(names)s and %(count)s others are typing …",
     "%(names)s and %(count)s others are typing …|one": "%(names)s and one other is typing …",
     "%(names)s and %(lastPerson)s are typing …": "%(names)s and %(lastPerson)s are typing …",
-    "A widget would like to verify your identity": "A widget would like to verify your identity",
-    "A widget located at %(widgetUrl)s would like to verify your identity. By allowing this, the widget will be able to verify your user ID, but not perform actions as you.": "A widget located at %(widgetUrl)s would like to verify your identity. By allowing this, the widget will be able to verify your user ID, but not perform actions as you.",
-    "Allow": "Allow",
     "This homeserver has hit its Monthly Active User limit.": "This homeserver has hit its Monthly Active User limit.",
     "This homeserver has exceeded one of its resource limits.": "This homeserver has exceeded one of its resource limits.",
     "Please <a>contact your service administrator</a> to continue using the service.": "Please <a>contact your service administrator</a> to continue using the service.",
@@ -927,6 +924,7 @@
     "NOTE: Apps are not end-to-end encrypted": "NOTE: Apps are not end-to-end encrypted",
     "Warning: This widget might use cookies.": "Warning: This widget might use cookies.",
     "Do you want to load widget from URL:": "Do you want to load widget from URL:",
+    "Allow": "Allow",
     "Delete Widget": "Delete Widget",
     "Deleting a widget removes it for all users in this room. Are you sure you want to delete this widget?": "Deleting a widget removes it for all users in this room. Are you sure you want to delete this widget?",
     "Delete widget": "Delete widget",
@@ -1176,6 +1174,10 @@
     "Room contains unknown devices": "Room contains unknown devices",
     "\"%(RoomName)s\" contains devices that you haven't seen before.": "\"%(RoomName)s\" contains devices that you haven't seen before.",
     "Unknown devices": "Unknown devices",
+    "A widget would like to verify your identity": "A widget would like to verify your identity",
+    "A widget located at %(widgetUrl)s would like to verify your identity. By allowing this, the widget will be able to verify your user ID, but not perform actions as you.": "A widget located at %(widgetUrl)s would like to verify your identity. By allowing this, the widget will be able to verify your user ID, but not perform actions as you.",
+    "Remember my selection for this widget": "Remember my selection for this widget",
+    "Deny": "Deny",
     "Unable to load backup status": "Unable to load backup status",
     "Recovery Key Mismatch": "Recovery Key Mismatch",
     "Backup could not be decrypted with this key: please verify that you entered the correct recovery key.": "Backup could not be decrypted with this key: please verify that you entered the correct recovery key.",
diff --git a/src/settings/Settings.js b/src/settings/Settings.js
index 4fe53633ff..fcf70b4df7 100644
--- a/src/settings/Settings.js
+++ b/src/settings/Settings.js
@@ -340,6 +340,13 @@ export const SETTINGS = {
         displayName: _td('Show developer tools'),
         default: false,
     },
+    "widgetOpenIDPermissions": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        default: {
+            whitelisted: [],
+            blacklisted: [],
+        },
+    },
     "RoomList.orderByImportance": {
         supportedLevels: LEVELS_ACCOUNT_SETTINGS,
         displayName: _td('Order rooms in the room list by most important first instead of most recent'),