diff --git a/src/components/login/CaptchaForm.js b/src/components/login/CaptchaForm.js
new file mode 100644
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+++ b/src/components/login/CaptchaForm.js
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+/*
+Copyright 2015 OpenMarket Ltd
+
+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.
+*/
+
+'use strict';
+
+var React = require('react');
+var DIV_ID = 'mx_recaptcha';
+
+/**
+ * A pure UI component which displays a captcha form.
+ */
+module.exports = React.createClass({
+    displayName: 'CaptchaForm',
+
+    propTypes: {
+        onCaptchaLoaded: React.PropTypes.func.isRequired // called with div id name
+    },
+
+    getDefaultProps: function() {
+        return {
+            onCaptchaLoaded: function() {
+                console.error("Unhandled onCaptchaLoaded");
+            }
+        };
+    },
+
+    componentDidMount: function() {
+        // Just putting a script tag into the returned jsx doesn't work, annoyingly,
+        // so we do this instead.
+        var self = this;
+        if (this.refs.recaptchaContainer) {
+            console.log("Loading recaptcha script...");
+            var scriptTag = document.createElement('script');
+            window.mx_on_recaptcha_loaded = function() {
+                console.log("Loaded recaptcha script.");
+                self.props.onCaptchaLoaded(DIV_ID);
+            };
+            scriptTag.setAttribute(
+                'src', global.location.protocol+"//www.google.com/recaptcha/api.js?onload=mx_on_recaptcha_loaded&render=explicit"
+            );
+            this.refs.recaptchaContainer.appendChild(scriptTag);
+        }
+    },
+
+    render: function() {
+        // FIXME: Tight coupling with the div id and SignupStages.js
+        return (
+            <div ref="recaptchaContainer">
+                This Home Server would like to make sure you are not a robot
+                <div id={DIV_ID}></div>
+            </div>
+        );
+    }
+});
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