diff --git a/.eslintrc.json b/.eslintrc.json
index 3fe678f0ff..690f159892 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -178,6 +178,7 @@
         "user_events": false,
         "voting_widget": false,
         "tictactoe_widget": false,
+        "todo_widget": false,
         "zform": false,
         "widgetize": false,
         "submessage": false,
diff --git a/frontend_tests/node_tests/widgetize.js b/frontend_tests/node_tests/widgetize.js
index f4c830d048..59a9d7c384 100644
--- a/frontend_tests/node_tests/widgetize.js
+++ b/frontend_tests/node_tests/widgetize.js
@@ -1,6 +1,7 @@
 set_global('$', global.make_zjquery());
 set_global('voting_widget', {});
 set_global('tictactoe_widget', {});
+set_global('todo_widget', {});
 set_global('zform', {});
 set_global('document', 'document-stub');
 
diff --git a/static/js/bundles/app.js b/static/js/bundles/app.js
index 9b79c0c778..c70e8ff496 100644
--- a/static/js/bundles/app.js
+++ b/static/js/bundles/app.js
@@ -65,6 +65,7 @@ import "js/top_left_corner.js";
 import "js/stream_list.js";
 import "js/filter.js";
 import 'js/voting_widget.js';
+import 'js/todo_widget.js';
 import 'js/tictactoe_widget.js';
 import 'js/zform.js';
 import 'js/widgetize.js';
diff --git a/static/js/todo_widget.js b/static/js/todo_widget.js
new file mode 100644
index 0000000000..009c99bcc4
--- /dev/null
+++ b/static/js/todo_widget.js
@@ -0,0 +1,192 @@
+var todo_widget = (function () {
+
+var exports = {};
+
+exports.task_data_holder = function (is_my_task_list) {
+    var self = {};
+
+    var all_tasks = [];
+    var pending_tasks = [];
+    var completed_tasks = [];
+    var my_idx = 0;
+
+    self.get_widget_data = function () {
+
+        var widget_data = {
+            pending_tasks: pending_tasks,
+            completed_tasks: completed_tasks,
+        };
+
+        return widget_data;
+    };
+
+    self.check_task = {
+        task_exists: function (task) {
+            var task_exists = _.any(all_tasks, function (item) {
+                return item.task === task;
+            });
+            return task_exists;
+        },
+    };
+
+    self.handle = {
+        new_task: {
+            outbound: function (task) {
+                var event = {
+                    type: 'new_task',
+                    key: my_idx,
+                    task: task,
+                    completed: false,
+                };
+                my_idx += 1;
+
+                if (is_my_task_list && !self.check_task.task_exists(task)) {
+                    return event;
+                }
+                return;
+            },
+
+            inbound: function (sender_id, data) {
+                var idx = data.key;
+                var task = data.task;
+                var completed = data.completed;
+
+                var task_data = {
+                    task: task,
+                    user_id: sender_id,
+                    key: idx,
+                    completed: completed,
+                };
+
+                if (!self.check_task.task_exists(task)) {
+                    pending_tasks.push(task_data);
+                    all_tasks.push(task_data);
+
+                    if (my_idx <= idx) {
+                        my_idx = idx + 1;
+                    }
+                }
+            },
+        },
+
+        strike: {
+            outbound: function (key) {
+                var event = {
+                    type: 'strike',
+                    key: key,
+                };
+
+                if (is_my_task_list) {
+                    return event;
+                }
+                return;
+            },
+
+            inbound: function (sender_id, data) {
+                var key = data.key;
+                var task = all_tasks[key];
+                var index;
+
+                if (task === undefined) {
+                    blueslip.error('unknown key for tasks: ' + key);
+                    return;
+                }
+
+                all_tasks[key].completed = !all_tasks[key].completed;
+
+                // toggle
+                if (task.completed) {
+                    index = pending_tasks.indexOf(task);
+                    pending_tasks.splice(index, 1);
+                    completed_tasks.unshift(task);
+                } else {
+                    index = completed_tasks.indexOf(task);
+                    completed_tasks.splice(index, 1);
+                    pending_tasks.push(task);
+                }
+            },
+        },
+    };
+
+    self.handle_event = function (sender_id, data) {
+        var type = data.type;
+        if (self.handle[type]) {
+            self.handle[type].inbound(sender_id, data);
+        }
+    };
+
+    return self;
+};
+
+exports.activate = function (opts) {
+    var elem = opts.elem;
+    var callback = opts.callback;
+
+    var is_my_task_list = people.is_my_user_id(opts.message.sender_id);
+    var task_data = exports.task_data_holder(is_my_task_list);
+
+    function render() {
+        var html = templates.render('todo-widget');
+        elem.html(html);
+
+        elem.find("button.add-task").on('click', function (e) {
+            e.stopPropagation();
+            elem.find(".widget-error").text('');
+            var task = elem.find("input.add-task").val().trim();
+
+            if (task === '') {
+                return;
+            }
+
+            elem.find(".add-task").val('').focus();
+
+            var task_exists = task_data.check_task.task_exists(task);
+            if (task_exists) {
+                elem.find(".widget-error").text(i18n.t('Task already exists'));
+                return;
+            }
+
+            var data = task_data.handle.new_task.outbound(task);
+            callback(data);
+        });
+    }
+
+    function render_results() {
+        var widget_data = task_data.get_widget_data();
+        var html = templates.render('todo-widget-tasks', widget_data);
+        elem.find('ul.todo-widget').html(html);
+        elem.find(".widget-error").text('');
+
+        if (!is_my_task_list) {
+            elem.find(".add-task-bar").hide();
+            elem.find("button.task").attr('disabled', true);
+        }
+
+        elem.find("button.task").on('click', function (e) {
+            e.stopPropagation();
+            var key = $(e.target).attr('data-key');
+
+            var data = task_data.handle.strike.outbound(key);
+            callback(data);
+        });
+    }
+
+    elem.handle_events = function (events) {
+        _.each(events, function (event) {
+            task_data.handle_event(event.sender_id, event.data);
+        });
+        render_results();
+    };
+
+    render();
+    render_results();
+};
+
+return exports;
+
+}());
+if (typeof module !== 'undefined') {
+    module.exports = todo_widget;
+}
+
+window.todo_widget = todo_widget;
diff --git a/static/js/widgetize.js b/static/js/widgetize.js
index 37245c199c..cdc6326ff5 100644
--- a/static/js/widgetize.js
+++ b/static/js/widgetize.js
@@ -6,6 +6,7 @@ var widgets = {};
 
 widgets.poll = voting_widget;
 widgets.tictactoe = tictactoe_widget;
+widgets.todo = todo_widget;
 widgets.zform = zform;
 
 var widget_contents = {};
diff --git a/static/styles/widgets.scss b/static/styles/widgets.scss
index 70667011a3..3235225367 100644
--- a/static/styles/widgets.scss
+++ b/static/styles/widgets.scss
@@ -16,23 +16,26 @@
     font-weight: 600;
 }
 
+.todo-widget h4,
 .poll-widget h4 {
-    font-size: 14px;
+    font-size: 18px;
     font-weight: 600;
 }
 
+.todo-widget li,
 .poll-widget li {
     list-style: none;
     margin: 2px 2px 2px 0px;
 }
 
+.todo-widget ul,
 .poll-widget ul {
     margin: 0px 0px 5px 0px;
     padding: 0;
 }
 
-.poll-widget .poll-names {
-    font-size: 10px;
+.poll-widget .poll-names .todo-widget {
+    font-size: 14px;
     color: green;
 }
 
@@ -41,17 +44,40 @@
 }
 
 .poll-vote {
-    border-radius: 2px;
     color: #3c906e;
     border-color: #9dc8b7;
     margin-right: 4px;
     background-color: white;
 }
 
+button.task {
+    height: 20px;
+    width: 20px;
+    background-color: transparent;
+    border-color: #9dc8b7;
+    margin-right: 4px;
+    border-radius: 3px;
+}
+
+button.task:hover {
+    border: 1px solid #2988a4;
+}
+
+button.task-completed {
+    border-color: #b9cec6;
+    padding: 0px;
+}
+
+img.task-completed {
+    width: 15px;
+}
+
 .poll-vote:hover {
     border-color: #59a687;
 }
 
+input.add-task,
+button.add-task,
 input.poll-comment,
 button.poll-comment,
 input.poll-question,
@@ -60,13 +86,22 @@ button.poll-question {
     margin: 2px 0px 2px 0px;
 }
 
-button.poll-comment, button.poll-question {
+button.add-task,
+button.poll-comment,
+button.poll-question {
     border-radius: 3px;
     border: 1px solid #cccccc;
     background-color: white;
     width: 100px;
 }
 
-button.poll-comment:hover, button.poll-question:hover {
+button.add-task:hover,
+button.poll-comment:hover,
+button.poll-question:hover {
     border-color: #999999;
 }
+
+.widget-error {
+    color: #b94a48;
+    font-size: 12px;
+}
diff --git a/static/templates/widgets/todo-widget-tasks.handlebars b/static/templates/widgets/todo-widget-tasks.handlebars
new file mode 100644
index 0000000000..4b7c335d41
--- /dev/null
+++ b/static/templates/widgets/todo-widget-tasks.handlebars
@@ -0,0 +1,16 @@
+<br />
+{{#each pending_tasks}}
+<li>
+    <button class="task" data-key="{{ key }}">
+    </button>
+    <span class="task">{{ task }}</span>
+</li>
+{{/each}}
+{{#each completed_tasks}}
+<li>
+    <button class="task-completed task" data-key="{{ key }}">
+        <img class="task-completed" src="/static/images/checkbox-green.svg" data-key="{{ key }}"/>
+    </button>
+    <span class="task"><strike>{{ task }}</strike></span>
+</li>
+{{/each}}
diff --git a/static/templates/widgets/todo-widget.handlebars b/static/templates/widgets/todo-widget.handlebars
new file mode 100644
index 0000000000..b2fd3b7ee2
--- /dev/null
+++ b/static/templates/widgets/todo-widget.handlebars
@@ -0,0 +1,10 @@
+<div class="todo-widget">
+    <h4>Task list</h4>
+    <div class="add-task-bar">
+        <input type="text" class="add-task" placeholder="{{t 'New task'}}" />
+        <button class="add-task">{{t "Add task" }}</button>
+        <div class="widget-error"></div>
+    </div>
+    <ul class="todo-widget">
+    </ul>
+</div>
diff --git a/zerver/lib/widget.py b/zerver/lib/widget.py
index 39d78c8fcc..f2b1f38ef9 100644
--- a/zerver/lib/widget.py
+++ b/zerver/lib/widget.py
@@ -18,7 +18,7 @@ def do_widget_pre_save_actions(message: MutableMapping[str, Any]) -> None:
         return
 
 def get_widget_data(content: str) -> Tuple[Optional[str], Optional[str]]:
-    valid_widget_types = ['tictactoe', 'poll']
+    valid_widget_types = ['tictactoe', 'poll', 'todo']
     tokens = content.split(' ')
     if not tokens:
         return None, None