diff --git a/api-generator/components/treetable.js b/api-generator/components/treetable.js
index fc000a320..80cf64b7b 100644
--- a/api-generator/components/treetable.js
+++ b/api-generator/components/treetable.js
@@ -5,6 +5,12 @@ const TreeTableProps = [
         default: 'null',
         description: 'An array of treenodes.'
     },
+    {
+        name: 'dataKey',
+        type: 'string|function',
+        default: 'null',
+        description: 'Name of the field that uniquely identifies the a record in the data.'
+    },
     {
         name: 'expandedKeys',
         type: 'array',
diff --git a/components/lib/treetable/BaseTreeTable.vue b/components/lib/treetable/BaseTreeTable.vue
index 0dcfb80d8..a34dbbdba 100644
--- a/components/lib/treetable/BaseTreeTable.vue
+++ b/components/lib/treetable/BaseTreeTable.vue
@@ -10,6 +10,10 @@ export default {
             type: null,
             default: null
         },
+        dataKey: {
+            type: [String, Function],
+            default: 'key'
+        },
         expandedKeys: {
             type: null,
             default: null
diff --git a/components/lib/treetable/TreeTable.d.ts b/components/lib/treetable/TreeTable.d.ts
index cfb06c3bd..2a0ea55ae 100755
--- a/components/lib/treetable/TreeTable.d.ts
+++ b/components/lib/treetable/TreeTable.d.ts
@@ -395,6 +395,11 @@ export interface TreeTableProps {
      * An array of treenodes.
      */
     value?: TreeNode[] | undefined;
+    /**
+     * Name of the field that uniquely identifies the a record in the data.
+     * @defaultValue "key"
+     */
+    dataKey?: string | ((item: any) => string) | undefined;
     /**
      * A map of keys to represent the state of the tree expansion state in controlled mode.
      * @see TreeTableExpandedKeys
diff --git a/components/lib/treetable/TreeTable.vue b/components/lib/treetable/TreeTable.vue
index 76b68b014..f138f87c2 100755
--- a/components/lib/treetable/TreeTable.vue
+++ b/components/lib/treetable/TreeTable.vue
@@ -83,7 +83,8 @@
                     <template v-if="!empty">
                         <TTRow
                             v-for="(node, index) of dataToRender"
-                            :key="node.key"
+                            :key="nodeKey(node)"
+                            :dataKey="dataKey"
                             :columns="columns"
                             :node="node"
                             :level="0"
@@ -252,8 +253,7 @@ export default {
             };
         },
         onNodeToggle(node) {
-            const key = node.key;
-
+            const key = this.nodeKey(node);
             if (this.d_expandedKeys[key]) {
                 delete this.d_expandedKeys[key];
                 this.$emit('node-collapse', node);
@@ -273,9 +273,13 @@ export default {
                 this.$emit('update:selectionKeys', _selectionKeys);
             }
         },
+        nodeKey(node) {
+            return ObjectUtils.resolveFieldData(node, this.dataKey);
+        },
         handleSelectionWithMetaKey(event) {
             const originalEvent = event.originalEvent;
             const node = event.node;
+            const nodeKey = this.nodeKey(node);
             const metaKey = originalEvent.metaKey || originalEvent.ctrlKey;
             const selected = this.isNodeSelected(node);
             let _selectionKeys;
@@ -285,7 +289,7 @@ export default {
                     _selectionKeys = {};
                 } else {
                     _selectionKeys = { ...this.selectionKeys };
-                    delete _selectionKeys[node.key];
+                    delete _selectionKeys[nodeKey];
                 }
 
                 this.$emit('node-unselect', node);
@@ -296,7 +300,7 @@ export default {
                     _selectionKeys = !metaKey ? {} : this.selectionKeys ? { ...this.selectionKeys } : {};
                 }
 
-                _selectionKeys[node.key] = true;
+                _selectionKeys[nodeKey] = true;
                 this.$emit('node-select', node);
             }
 
@@ -304,6 +308,7 @@ export default {
         },
         handleSelectionWithoutMetaKey(event) {
             const node = event.node;
+            const nodeKey = this.nodeKey(node);
             const selected = this.isNodeSelected(node);
             let _selectionKeys;
 
@@ -313,18 +318,18 @@ export default {
                     this.$emit('node-unselect', node);
                 } else {
                     _selectionKeys = {};
-                    _selectionKeys[node.key] = true;
+                    _selectionKeys[nodeKey] = true;
                     this.$emit('node-select', node);
                 }
             } else {
                 if (selected) {
                     _selectionKeys = { ...this.selectionKeys };
-                    delete _selectionKeys[node.key];
+                    delete _selectionKeys[nodeKey];
 
                     this.$emit('node-unselect', node);
                 } else {
                     _selectionKeys = this.selectionKeys ? { ...this.selectionKeys } : {};
-                    _selectionKeys[node.key] = true;
+                    _selectionKeys[nodeKey] = true;
 
                     this.$emit('node-select', node);
                 }
@@ -572,7 +577,7 @@ export default {
             return matched;
         },
         isNodeSelected(node) {
-            return this.selectionMode && this.selectionKeys ? this.selectionKeys[node.key] === true : false;
+            return this.selectionMode && this.selectionKeys ? this.selectionKeys[this.nodeKey(node)] === true : false;
         },
         isNodeLeaf(node) {
             return node.leaf === false ? false : !(node.children && node.children.length);
diff --git a/components/lib/treetable/TreeTableRow.vue b/components/lib/treetable/TreeTableRow.vue
index f92ff88e2..283b9eec0 100755
--- a/components/lib/treetable/TreeTableRow.vue
+++ b/components/lib/treetable/TreeTableRow.vue
@@ -41,7 +41,8 @@
     <template v-if="expanded && node.children && node.children.length">
         <TreeTableRow
             v-for="childNode of node.children"
-            :key="childNode.key"
+            :key="nodeKey(childNode)"
+            :dataKey="dataKey"
             :columns="columns"
             :node="childNode"
             :parentNode="node"
@@ -76,6 +77,10 @@ export default {
             type: null,
             default: null
         },
+        dataKey: {
+            type: [String, Function],
+            default: 'key'
+        },
         parentNode: {
             type: null,
             default: null
@@ -150,6 +155,9 @@ export default {
         onTouchEnd() {
             this.nodeTouched = true;
         },
+        nodeKey(node) {
+            return ObjectUtils.resolveFieldData(node, this.dataKey);
+        },
         onKeyDown(event, item) {
             switch (event.code) {
                 case 'ArrowDown':
@@ -320,8 +328,8 @@ export default {
             });
         },
         propagateDown(node, check, selectionKeys) {
-            if (check) selectionKeys[node.key] = { checked: true, partialChecked: false };
-            else delete selectionKeys[node.key];
+            if (check) selectionKeys[this.nodeKey(node)] = { checked: true, partialChecked: false };
+            else delete selectionKeys[this.nodeKey(node)];
 
             if (node.children && node.children.length) {
                 for (let child of node.children) {
@@ -336,19 +344,19 @@ export default {
             let childPartialSelected = false;
 
             for (let child of this.node.children) {
-                if (_selectionKeys[child.key] && _selectionKeys[child.key].checked) checkedChildCount++;
-                else if (_selectionKeys[child.key] && _selectionKeys[child.key].partialChecked) childPartialSelected = true;
+                if (_selectionKeys[this.nodeKey(child)] && _selectionKeys[this.nodeKey(child)].checked) checkedChildCount++;
+                else if (_selectionKeys[this.nodeKey(child)] && _selectionKeys[this.nodeKey(child)].partialChecked) childPartialSelected = true;
             }
 
             if (check && checkedChildCount === this.node.children.length) {
-                _selectionKeys[this.node.key] = { checked: true, partialChecked: false };
+                _selectionKeys[this.nodeKey(this.node)] = { checked: true, partialChecked: false };
             } else {
                 if (!check) {
-                    delete _selectionKeys[this.node.key];
+                    delete _selectionKeys[this.nodeKey(this.node)];
                 }
 
-                if (childPartialSelected || (checkedChildCount > 0 && checkedChildCount !== this.node.children.length)) _selectionKeys[this.node.key] = { checked: false, partialChecked: true };
-                else _selectionKeys[this.node.key] = { checked: false, partialChecked: false };
+                if (childPartialSelected || (checkedChildCount > 0 && checkedChildCount !== this.node.children.length)) _selectionKeys[this.nodeKey(this.node)] = { checked: false, partialChecked: true };
+                else _selectionKeys[this.nodeKey(this.node)] = { checked: false, partialChecked: false };
             }
 
             this.$emit('checkbox-change', {
@@ -364,19 +372,19 @@ export default {
             let childPartialSelected = false;
 
             for (let child of this.node.children) {
-                if (_selectionKeys[child.key] && _selectionKeys[child.key].checked) checkedChildCount++;
-                else if (_selectionKeys[child.key] && _selectionKeys[child.key].partialChecked) childPartialSelected = true;
+                if (_selectionKeys[this.nodeKey(child)] && _selectionKeys[this.nodeKey(child)].checked) checkedChildCount++;
+                else if (_selectionKeys[this.nodeKey(child)] && _selectionKeys[this.nodeKey(child)].partialChecked) childPartialSelected = true;
             }
 
             if (check && checkedChildCount === this.node.children.length) {
-                _selectionKeys[this.node.key] = { checked: true, partialChecked: false };
+                _selectionKeys[this.nodeKey(this.node)] = { checked: true, partialChecked: false };
             } else {
                 if (!check) {
-                    delete _selectionKeys[this.node.key];
+                    delete _selectionKeys[this.nodeKey(this.node)];
                 }
 
-                if (childPartialSelected || (checkedChildCount > 0 && checkedChildCount !== this.node.children.length)) _selectionKeys[this.node.key] = { checked: false, partialChecked: true };
-                else _selectionKeys[this.node.key] = { checked: false, partialChecked: false };
+                if (childPartialSelected || (checkedChildCount > 0 && checkedChildCount !== this.node.children.length)) _selectionKeys[this.nodeKey(this.node)] = { checked: false, partialChecked: true };
+                else _selectionKeys[this.nodeKey(this.node)] = { checked: false, partialChecked: false };
             }
 
             this.$emit('checkbox-change', {
@@ -402,19 +410,19 @@ export default {
             return [this.node.styleClass, this.cx('row')];
         },
         expanded() {
-            return this.expandedKeys && this.expandedKeys[this.node.key] === true;
+            return this.expandedKeys && this.expandedKeys[this.nodeKey(this.node)] === true;
         },
         leaf() {
             return this.node.leaf === false ? false : !(this.node.children && this.node.children.length);
         },
         selected() {
-            return this.selectionMode && this.selectionKeys ? this.selectionKeys[this.node.key] === true : false;
+            return this.selectionMode && this.selectionKeys ? this.selectionKeys[this.nodeKey(this.node)] === true : false;
         },
         checked() {
-            return this.selectionKeys ? this.selectionKeys[this.node.key] && this.selectionKeys[this.node.key].checked : false;
+            return this.selectionKeys ? this.selectionKeys[this.nodeKey(this.node)] && this.selectionKeys[this.nodeKey(this.node)].checked : false;
         },
         partialChecked() {
-            return this.selectionKeys ? this.selectionKeys[this.node.key] && this.selectionKeys[this.node.key].partialChecked : false;
+            return this.selectionKeys ? this.selectionKeys[this.nodeKey(this.node)] && this.selectionKeys[this.nodeKey(this.node)].partialChecked : false;
         },
         getAriaSelected() {
             return this.selectionMode === 'single' || this.selectionMode === 'multiple' ? this.selected : null;
diff --git a/doc/treetable/selection/CheckboxRowSelectionDoc.vue b/doc/treetable/selection/CheckboxRowSelectionDoc.vue
index a3f4c7760..ec22036cb 100644
--- a/doc/treetable/selection/CheckboxRowSelectionDoc.vue
+++ b/doc/treetable/selection/CheckboxRowSelectionDoc.vue
@@ -1,7 +1,9 @@
 <template>
     <DocSectionText v-bind="$attrs">
         <p>Selection of multiple nodes via checkboxes is enabled by configuring <i>selectionMode</i> as <i>checkbox</i>.</p>
-        <p>In checkbox selection mode, value binding should be a key-value pair where key is the node key and value is an object that has <i>checked</i> and <i>partialChecked</i> properties to represent the checked state of a node.</p>
+        <p>
+            In checkbox selection mode, value binding should be a key-value pair where key (or the dataKey) is the node key and value is an object that has <i>checked</i> and <i>partialChecked</i> properties to represent the checked state of a node.
+        </p>
     </DocSectionText>
     <DocSectionCode :code="introCode" hideToggleCode importCode hideCodeSandbox hideStackBlitz />
     <div class="card">