diff --git a/devtools/client/inspector/flexbox/components/FlexContainer.js b/devtools/client/inspector/flexbox/components/FlexContainer.js
index a96f9b64c28d..b912dd6bf03a 100644
--- a/devtools/client/inspector/flexbox/components/FlexContainer.js
+++ b/devtools/client/inspector/flexbox/components/FlexContainer.js
@@ -4,11 +4,15 @@
 
 "use strict";
 
-const { createRef, PureComponent } = require("devtools/client/shared/vendor/react");
+const { createFactory, createRef, PureComponent } = require("devtools/client/shared/vendor/react");
 const dom = require("devtools/client/shared/vendor/react-dom-factories");
 const PropTypes = require("devtools/client/shared/vendor/react-prop-types");
 const { translateNodeFrontToGrip } = require("devtools/client/inspector/shared/utils");
 
+loader.lazyGetter(this, "FlexItemSelector", function() {
+  return createFactory(require("./FlexItemSelector"));
+});
+
 // Reps
 const { REPS, MODE } = require("devtools/client/shared/components/reps/reps");
 const { Rep } = REPS;
@@ -25,6 +29,7 @@ class FlexContainer extends PureComponent {
       onSetFlexboxOverlayColor: PropTypes.func.isRequired,
       onShowBoxModelHighlighterForNode: PropTypes.func.isRequired,
       onToggleFlexboxHighlighter: PropTypes.func.isRequired,
+      onToggleFlexItemShown: PropTypes.func.isRequired,
       setSelectedNode: PropTypes.func.isRequired,
     };
   }
@@ -96,6 +101,33 @@ class FlexContainer extends PureComponent {
     nodeFront.scrollIntoView().catch(e => console.error(e));
   }
 
+  renderFlexItemSelector() {
+    const {
+      flexbox,
+      onToggleFlexItemShown,
+    } = this.props;
+    const {
+      flexItems,
+      highlighted,
+    } = flexbox;
+
+    if (!highlighted || !flexItems.length) {
+      return null;
+    }
+
+    const selectedFlexItem = flexItems.find(item => item.shown);
+
+    if (!selectedFlexItem) {
+      return null;
+    }
+
+    return FlexItemSelector({
+      flexItem: selectedFlexItem,
+      flexItems,
+      onToggleFlexItemShown,
+    });
+  }
+
   render() {
     const {
       flexbox,
@@ -110,47 +142,50 @@ class FlexContainer extends PureComponent {
 
     return (
       dom.div({ className: "flex-container devtools-monospace" },
-        dom.label({},
-          dom.input(
+        dom.div({},
+          dom.label({},
+            dom.input(
+              {
+                className: "devtools-checkbox-toggle",
+                checked: highlighted,
+                onChange: this.onFlexboxCheckboxClick,
+                type: "checkbox",
+              }
+            ),
+            Rep(
+              {
+                defaultRep: ElementNode,
+                mode: MODE.TINY,
+                object: translateNodeFrontToGrip(nodeFront),
+                onDOMNodeMouseOut: () => onHideBoxModelHighlighter(),
+                onDOMNodeMouseOver: () => onShowBoxModelHighlighterForNode(nodeFront),
+                onInspectIconClick: () => this.onFlexboxInspectIconClick(nodeFront),
+              }
+            )
+          ),
+          dom.div(
             {
-              className: "devtools-checkbox-toggle",
-              checked: highlighted,
-              onChange: this.onFlexboxCheckboxClick,
-              type: "checkbox",
+              className: "layout-color-swatch",
+              ref: this.swatchEl,
+              style: {
+                backgroundColor: color,
+              },
+              title: color,
             }
           ),
-          Rep(
+          // The SwatchColorPicker relies on the nextSibling of the swatch element to
+          // apply the selected color. This is why we use a span in display: none for
+          // now. Ideally we should modify the SwatchColorPickerTooltip to bypass this
+          // requirement. See https://bugzilla.mozilla.org/show_bug.cgi?id=1341578
+          dom.span(
             {
-              defaultRep: ElementNode,
-              mode: MODE.TINY,
-              object: translateNodeFrontToGrip(nodeFront),
-              onDOMNodeMouseOut: () => onHideBoxModelHighlighter(),
-              onDOMNodeMouseOver: () => onShowBoxModelHighlighterForNode(nodeFront),
-              onInspectIconClick: () => this.onFlexboxInspectIconClick(nodeFront),
-            }
+              className: "layout-color-value",
+              ref: this.colorValueEl,
+            },
+            color
           )
         ),
-        dom.div(
-          {
-            className: "layout-color-swatch",
-            ref: this.swatchEl,
-            style: {
-              backgroundColor: color,
-            },
-            title: color,
-          }
-        ),
-        // The SwatchColorPicker relies on the nextSibling of the swatch element to apply
-        // the selected color. This is why we use a span in display: none for now.
-        // Ideally we should modify the SwatchColorPickerTooltip to bypass this
-        // requirement. See https://bugzilla.mozilla.org/show_bug.cgi?id=1341578
-        dom.span(
-          {
-            className: "layout-color-value",
-            ref: this.colorValueEl,
-          },
-          color
-        )
+        this.renderFlexItemSelector()
       )
     );
   }
diff --git a/devtools/client/inspector/flexbox/components/FlexItemSelector.js b/devtools/client/inspector/flexbox/components/FlexItemSelector.js
new file mode 100644
index 000000000000..7589bafb4b0f
--- /dev/null
+++ b/devtools/client/inspector/flexbox/components/FlexItemSelector.js
@@ -0,0 +1,119 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { PureComponent } = require("devtools/client/shared/vendor/react");
+const dom = require("devtools/client/shared/vendor/react-dom-factories");
+const PropTypes = require("devtools/client/shared/vendor/react-prop-types");
+const { translateNodeFrontToGrip } = require("devtools/client/inspector/shared/utils");
+
+// Reps
+const { REPS, MODE } = require("devtools/client/shared/components/reps/reps");
+const { Rep } = REPS;
+const ElementNode = REPS.ElementNode;
+
+const Types = require("../types");
+
+loader.lazyRequireGetter(this, "showMenu", "devtools/client/shared/components/menu/utils", true);
+
+class FlexItemSelector extends PureComponent {
+  static get propTypes() {
+    return {
+      flexItem: PropTypes.shape(Types.flexItem).isRequired,
+      flexItems: PropTypes.arrayOf(PropTypes.shape(Types.flexItem)).isRequired,
+      onToggleFlexItemShown: PropTypes.func.isRequired,
+    };
+  }
+
+  constructor(props) {
+    super(props);
+    this.onShowFlexItemMenu = this.onShowFlexItemMenu.bind(this);
+  }
+
+  onShowFlexItemMenu(event) {
+    const {
+      flexItem,
+      flexItems,
+      onToggleFlexItemShown,
+    } = this.props;
+    const menuItems = [];
+
+    for (const item of flexItems) {
+      const grip = translateNodeFrontToGrip(item.nodeFront);
+      menuItems.push({
+        label: getLabel(grip),
+        type: "checkbox",
+        checked: item === flexItem,
+        click: () => onToggleFlexItemShown(item.nodeFront),
+      });
+    }
+
+    showMenu(menuItems, {
+      button: event.target,
+    });
+  }
+
+  render() {
+    const { flexItem } = this.props;
+
+    return (
+      dom.div({ className: "flex-item-selector-wrapper" },
+        dom.button(
+          {
+            id: "flex-item-selector",
+            className: "devtools-button devtools-dropdown-button",
+            onClick: this.onShowFlexItemMenu,
+          },
+          Rep(
+            {
+              defaultRep: ElementNode,
+              mode: MODE.TINY,
+              object: translateNodeFrontToGrip(flexItem.nodeFront)
+            }
+          )
+        )
+      )
+    );
+  }
+}
+
+/**
+ * Returns a selector label of the Element Rep from the grip. This is based on the
+ * getElements() function in our devtools-reps component for a ElementNode.
+ *
+ * @param  {Object} grip
+ *         Grip-like object that can be used with Reps.
+ * @return {String} selector label of the element node.
+ */
+function getLabel(grip) {
+  const {
+    attributes,
+    nodeName,
+    isAfterPseudoElement,
+    isBeforePseudoElement
+  } = grip.preview;
+
+  if (isAfterPseudoElement || isBeforePseudoElement) {
+    return `::${isAfterPseudoElement ? "after" : "before"}`;
+  }
+
+  let label = nodeName;
+
+  if (attributes.id) {
+    label += `#${attributes.id}`;
+  }
+
+  if (attributes.class) {
+    label += attributes.class
+      .trim()
+      .split(/\s+/)
+      .map(cls => `.${cls}`)
+      .join("");
+  }
+
+  return label;
+}
+
+module.exports = FlexItemSelector;
diff --git a/devtools/client/inspector/flexbox/components/Flexbox.js b/devtools/client/inspector/flexbox/components/Flexbox.js
index 0d921a337d23..b2cbc14838a6 100644
--- a/devtools/client/inspector/flexbox/components/Flexbox.js
+++ b/devtools/client/inspector/flexbox/components/Flexbox.js
@@ -95,6 +95,7 @@ class Flexbox extends PureComponent {
       onSetFlexboxOverlayColor,
       onShowBoxModelHighlighterForNode,
       onToggleFlexboxHighlighter,
+      onToggleFlexItemShown,
       setSelectedNode,
     } = this.props;
 
@@ -115,6 +116,7 @@ class Flexbox extends PureComponent {
           onSetFlexboxOverlayColor,
           onShowBoxModelHighlighterForNode,
           onToggleFlexboxHighlighter,
+          onToggleFlexItemShown,
           setSelectedNode,
         }),
         this.renderFlexItemList(),
diff --git a/devtools/client/inspector/flexbox/components/moz.build b/devtools/client/inspector/flexbox/components/moz.build
index 2a76b1f11aa2..4b3568e9f68b 100644
--- a/devtools/client/inspector/flexbox/components/moz.build
+++ b/devtools/client/inspector/flexbox/components/moz.build
@@ -10,5 +10,6 @@ DevToolsModules(
     'FlexContainerProperties.js',
     'FlexItem.js',
     'FlexItemList.js',
+    'FlexItemSelector.js',
     'FlexItemSizingProperties.js',
 )
diff --git a/devtools/client/themes/layout.css b/devtools/client/themes/layout.css
index 6b557a157f79..d6a6ce51828c 100644
--- a/devtools/client/themes/layout.css
+++ b/devtools/client/themes/layout.css
@@ -2,6 +2,14 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+:root {
+  --flex-item-selector-wrapper-border-color: var(--theme-content-color3);
+}
+
+:root.theme-dark {
+  --flex-item-selector-wrapper-border-color: var(--theme-content-color1);
+}
+
 #layout-container {
   height: 100%;
   width: 100%;
@@ -112,6 +120,46 @@
   background-color: transparent;
 }
 
+/**
+ * Flex Item Selector
+ */
+
+.flex-item-selector-wrapper {
+  margin-inline-start: 25px;
+  position: relative;
+}
+
+.flex-item-selector-wrapper::before {
+  position: absolute;
+  left: -12px;
+  top: 3px;
+  content: '';
+  display: block;
+  border-left: 0.5px solid var(--flex-item-selector-wrapper-border-color);
+  height: 0.8em;
+  border-bottom: 0.5px solid var(--flex-item-selector-wrapper-border-color);
+  width: 10px;
+}
+
+
+#flex-item-selector {
+  background-position: right 4px center;
+  padding-left: 0;
+  vertical-align: middle;
+  width: 140px;
+}
+
+#flex-item-selector .objectBox-node {
+  display: inline-block;
+  font-size: 12px;
+  overflow: hidden;
+  padding-top: 0.15em;
+  text-align: left;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  width: 85%;
+}
+
 /**
  * Flex Item Sizing Properties
  */