diff --git a/doc/qweb.md b/doc/qweb.md
index 3d5a626b..1cfed1ad 100644
--- a/doc/qweb.md
+++ b/doc/qweb.md
@@ -13,7 +13,6 @@
   - [`t-if` directive](#t-if-directive)
   - [Expression evaluation](#expression-evaluation)
   - [Dynamic attributes (`t-att` and `t-attf` directives)](#dynamic-attributes-t-att-and-t-attf-directives)
-  - [`t-attf` directive (dynamic attributes)](#t-att-directive-dynamic-attributes)
   - [`t-call` directive (sub templates)](#t-call-directive-sub-templates)
 
 - [JS/OWL Specific Extensions](#jsowl-specific-extensions)
@@ -453,6 +452,30 @@ constructor. This will be assigned to the `props` variable, which can be accesse
 on the widget (and also, in the template). Whenever the state is updated, then
 the subwidget will also be updated automatically.
 
+The `t-widget` directive also accepts dynamic values with string interpolation
+(like the [`t-attf-`](#dynamic-attributes-t-att-and-t-attf-directives) directive):
+
+```xml
+<div t-name="ParentWidget">
+    <t t-widget="ChildWidget#{id}"/>
+</div>
+```
+
+```js
+class ParentWidget {
+  widgets = { ChildWidget1, ChildWidget2 };
+  state = { id: 1 };
+}
+```
+
+Similarly to `t-attf-`, there is an alternate form of string interpolation:
+
+```xml
+<div t-name="ParentWidget">
+    <t t-widget="ChildWidget{{id}}"/>
+</div>
+```
+
 ### `t-ref` directive
 
 The `t-ref` directive helps a component keep reference to some inside part of it.
@@ -481,8 +504,9 @@ Note: if used on a component, the reference will be set in the `refs`
 variable between `willPatch` and `patched`.
 
 The `t-ref` directive also accepts dynamic values with string interpolation
-(like the `t-attf-` directive). For example, if we have `id` set to 44 in the
-rendering context,
+(like the [`t-attf-`](#dynamic-attributes-t-att-and-t-attf-directives) and
+[`t-widget-`](#component-t-widget-t-props) directives). For example, if we have
+`id` set to 44 in the rendering context,
 
 ```xml
 <div t-ref="widget_#{id}"/>
@@ -492,7 +516,8 @@ rendering context,
 this.refs.widget_44;
 ```
 
-Similarly to `t-attf-`, there is an alternate form of string interpolation:
+Similarly to `t-attf-` and `t-widget`, there is an alternate form of string
+interpolation:
 
 ```xml
 <div t-ref="widget_{{id}}"/>
diff --git a/src/qweb_extensions.ts b/src/qweb_extensions.ts
index 0d03441c..58e79f40 100644
--- a/src/qweb_extensions.ts
+++ b/src/qweb_extensions.ts
@@ -459,13 +459,14 @@ QWeb.addDirective({
 
     ctx.addIf(`!w${widgetID}`);
     // new widget
+    ctx.addLine(`let widgetKey${widgetID} = ${ctx.interpolate(value)};`);
     ctx.addLine(
-      `let W${widgetID} = context.widgets && context.widgets['${value}'] || QWeb.widgets['${value}'];`
+      `let W${widgetID} = context.widgets && context.widgets[widgetKey${widgetID}] || QWeb.widgets[widgetKey${widgetID}];`
     );
 
     // maybe only do this in dev mode...
     ctx.addLine(
-      `if (!W${widgetID}) {throw new Error(\`Cannot find the definition of widget "${value}"\`)}`
+      `if (!W${widgetID}) {throw new Error('Cannot find the definition of widget "' + widgetKey${widgetID} + '"')}`
     );
     ctx.addLine(`w${widgetID} = new W${widgetID}(owner, props${widgetID});`);
     ctx.addLine(
diff --git a/tests/__snapshots__/animations.test.ts.snap b/tests/__snapshots__/animations.test.ts.snap
index f6056be5..271d4621 100644
--- a/tests/__snapshots__/animations.test.ts.snap
+++ b/tests/__snapshots__/animations.test.ts.snap
@@ -20,8 +20,9 @@ exports[`animations t-transition combined with t-widget 1`] = `
         w4 = false
     }
     if (!w4) {
-        let W4 = context.widgets && context.widgets['Child'] || QWeb.widgets['Child'];
-        if (!W4) {throw new Error(\`Cannot find the definition of widget \\"Child\\"\`)}
+        let widgetKey4 = \`Child\`;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
         w4 = new W4(owner, props4);
         context.__owl__.cmap[4] = w4.__owl__.id;
         def3 = w4._prepare();
@@ -59,8 +60,9 @@ exports[`animations t-transition combined with t-widget and t-if 1`] = `
             w4 = false
         }
         if (!w4) {
-            let W4 = context.widgets && context.widgets['Child'] || QWeb.widgets['Child'];
-            if (!W4) {throw new Error(\`Cannot find the definition of widget \\"Child\\"\`)}
+            let widgetKey4 = \`Child\`;
+            let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+            if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
             w4 = new W4(owner, props4);
             context.__owl__.cmap[4] = w4.__owl__.id;
             def3 = w4._prepare();
diff --git a/tests/__snapshots__/component.test.ts.snap b/tests/__snapshots__/component.test.ts.snap
index eb541ce7..08946eb1 100644
--- a/tests/__snapshots__/component.test.ts.snap
+++ b/tests/__snapshots__/component.test.ts.snap
@@ -21,8 +21,9 @@ exports[`class and style attributes with t-widget dynamic t-att-style is properl
         w4 = false
     }
     if (!w4) {
-        let W4 = context.widgets && context.widgets['child'] || QWeb.widgets['child'];
-        if (!W4) {throw new Error(\`Cannot find the definition of widget \\"child\\"\`)}
+        let widgetKey4 = \`child\`;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
         w4 = new W4(owner, props4);
         context.__owl__.cmap[4] = w4.__owl__.id;
         def3 = w4._prepare();
@@ -57,8 +58,9 @@ exports[`class and style attributes with t-widget t-att-class is properly added/
         w4 = false
     }
     if (!w4) {
-        let W4 = context.widgets && context.widgets['child'] || QWeb.widgets['child'];
-        if (!W4) {throw new Error(\`Cannot find the definition of widget \\"child\\"\`)}
+        let widgetKey4 = \`child\`;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
         w4 = new W4(owner, props4);
         context.__owl__.cmap[4] = w4.__owl__.id;
         def3 = w4._prepare();
@@ -111,8 +113,9 @@ exports[`composition sub widgets with some state rendered in a loop 1`] = `
             w7 = false
         }
         if (!w7) {
-            let W7 = context.widgets && context.widgets['ChildWidget'] || QWeb.widgets['ChildWidget'];
-            if (!W7) {throw new Error(\`Cannot find the definition of widget \\"ChildWidget\\"\`)}
+            let widgetKey7 = \`ChildWidget\`;
+            let W7 = context.widgets && context.widgets[widgetKey7] || QWeb.widgets[widgetKey7];
+            if (!W7) {throw new Error('Cannot find the definition of widget \\"' + widgetKey7 + '\\"')}
             w7 = new W7(owner, props7);
             context.__owl__.cmap[key8] = w7.__owl__.id;
             def6 = w7._prepare();
@@ -127,6 +130,78 @@ exports[`composition sub widgets with some state rendered in a loop 1`] = `
 }"
 `;
 
+exports[`composition t-widget with dynamic value 1`] = `
+"function anonymous(context,extra
+) {
+    let utils = this.utils;
+    let QWeb = this.constructor;
+    let owner = context;
+    var h = this.utils.h;
+    let c1 = [], p1 = {key:1};
+    var vn1 = h('div', p1, c1);
+    //WIDGET
+    let _2_index = c1.length;
+    c1.push(null);
+    let def3;
+    let w4 = 4 in context.__owl__.cmap ? context.__owl__.children[context.__owl__.cmap[4]] : false;
+    let props4 = {};
+    if (w4 && w4.__owl__.renderPromise && !w4.__owl__.vnode && props4 !== w4.__owl__.renderProps) {
+        w4.destroy();
+        w4 = false
+    }
+    if (!w4) {
+        let widgetKey4 = context['state'].widget;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
+        w4 = new W4(owner, props4);
+        context.__owl__.cmap[4] = w4.__owl__.id;
+        def3 = w4._prepare();
+        def3 = def3.then(vnode=>{let pvnode=h(vnode.sel, {key: 4, hook: {insert(vn) {let nvn=w4._mount(vnode, pvnode.elm);pvnode.elm=nvn.elm;},remove() {},destroy(vn) {w4.destroy();}}});c1[_2_index]=pvnode;w4.__owl__.pvnode = pvnode;});
+    } else {
+        def3 = w4._updateProps(props4, extra.forceUpdate, extra.patchQueue);
+        def3 = def3.then(()=>{if (w4.__owl__.isDestroyed) {return};let pvnode=w4.__owl__.pvnode;c1[_2_index]=pvnode;});
+    }
+    extra.promises.push(def3);
+    return vn1;
+}"
+`;
+
+exports[`composition t-widget with dynamic value 2 1`] = `
+"function anonymous(context,extra
+) {
+    let utils = this.utils;
+    let QWeb = this.constructor;
+    let owner = context;
+    var h = this.utils.h;
+    let c1 = [], p1 = {key:1};
+    var vn1 = h('div', p1, c1);
+    //WIDGET
+    let _2_index = c1.length;
+    c1.push(null);
+    let def3;
+    let w4 = 4 in context.__owl__.cmap ? context.__owl__.children[context.__owl__.cmap[4]] : false;
+    let props4 = {};
+    if (w4 && w4.__owl__.renderPromise && !w4.__owl__.vnode && props4 !== w4.__owl__.renderProps) {
+        w4.destroy();
+        w4 = false
+    }
+    if (!w4) {
+        let widgetKey4 = \`Widget\${context['state'].widget}\`;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
+        w4 = new W4(owner, props4);
+        context.__owl__.cmap[4] = w4.__owl__.id;
+        def3 = w4._prepare();
+        def3 = def3.then(vnode=>{let pvnode=h(vnode.sel, {key: 4, hook: {insert(vn) {let nvn=w4._mount(vnode, pvnode.elm);pvnode.elm=nvn.elm;},remove() {},destroy(vn) {w4.destroy();}}});c1[_2_index]=pvnode;w4.__owl__.pvnode = pvnode;});
+    } else {
+        def3 = w4._updateProps(props4, extra.forceUpdate, extra.patchQueue);
+        def3 = def3.then(()=>{if (w4.__owl__.isDestroyed) {return};let pvnode=w4.__owl__.pvnode;c1[_2_index]=pvnode;});
+    }
+    extra.promises.push(def3);
+    return vn1;
+}"
+`;
+
 exports[`random stuff/miscellaneous snapshotting compiled code 1`] = `
 "function anonymous(context,extra
 ) {
@@ -148,8 +223,9 @@ exports[`random stuff/miscellaneous snapshotting compiled code 1`] = `
         w4 = false
     }
     if (!w4) {
-        let W4 = context.widgets && context.widgets['child'] || QWeb.widgets['child'];
-        if (!W4) {throw new Error(\`Cannot find the definition of widget \\"child\\"\`)}
+        let widgetKey4 = \`child\`;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
         w4 = new W4(owner, props4);
         context.__owl__.cmap[key5] = w4.__owl__.id;
         def3 = w4._prepare();
@@ -183,8 +259,9 @@ exports[`random stuff/miscellaneous t-props should not be undefined (snapshottin
         w4 = false
     }
     if (!w4) {
-        let W4 = context.widgets && context.widgets['child'] || QWeb.widgets['child'];
-        if (!W4) {throw new Error(\`Cannot find the definition of widget \\"child\\"\`)}
+        let widgetKey4 = \`child\`;
+        let W4 = context.widgets && context.widgets[widgetKey4] || QWeb.widgets[widgetKey4];
+        if (!W4) {throw new Error('Cannot find the definition of widget \\"' + widgetKey4 + '\\"')}
         w4 = new W4(owner, props4);
         context.__owl__.cmap[4] = w4.__owl__.id;
         def3 = w4._prepare();
diff --git a/tests/component.test.ts b/tests/component.test.ts
index 12d0b46c..b01c0307 100644
--- a/tests/component.test.ts
+++ b/tests/component.test.ts
@@ -857,7 +857,7 @@ describe("composition", () => {
     const widget = new ParentWidget(env);
     await widget.mount(fixture);
     expect(fixture.innerHTML).toBe("<div><div>world</div></div>");
-    delete QWeb.widgets['WidgetB'];
+    delete QWeb.widgets["WidgetB"];
   });
 
   test("don't fallback to global registry if widget defined locally", async () => {
@@ -871,7 +871,7 @@ describe("composition", () => {
     const widget = new ParentWidget(env);
     await widget.mount(fixture);
     expect(fixture.innerHTML).toBe("<div><span>Belgium</span></div>");
-    delete QWeb.widgets['WidgetB'];
+    delete QWeb.widgets["WidgetB"];
   });
 
   test("throw a nice error if it cannot find widget", async () => {
@@ -1254,6 +1254,36 @@ describe("composition", () => {
     `)
     );
   });
+
+  test("t-widget with dynamic value", async () => {
+    env.qweb.addTemplate(
+      "ParentWidget",
+      `<div><t t-widget="{{state.widget}}"/></div>`
+    );
+    class ParentWidget extends Widget {
+      widgets = { WidgetB };
+      state = { widget: "WidgetB" };
+    }
+    const widget = new ParentWidget(env);
+    await widget.mount(fixture);
+    expect(fixture.innerHTML).toBe("<div><div>world</div></div>");
+    expect(env.qweb.templates.ParentWidget.fn.toString()).toMatchSnapshot();
+  });
+
+  test("t-widget with dynamic value 2", async () => {
+    env.qweb.addTemplate(
+      "ParentWidget",
+      `<div><t t-widget="Widget{{state.widget}}"/></div>`
+    );
+    class ParentWidget extends Widget {
+      widgets = { WidgetB };
+      state = { widget: "B" };
+    }
+    const widget = new ParentWidget(env);
+    await widget.mount(fixture);
+    expect(fixture.innerHTML).toBe("<div><div>world</div></div>");
+    expect(env.qweb.templates.ParentWidget.fn.toString()).toMatchSnapshot();
+  });
 });
 
 describe("props evaluation (with t-props directive)", () => {