diff --git a/core/api.txt b/core/api.txt
index 0c58b40aa5..90dd898080 100644
--- a/core/api.txt
+++ b/core/api.txt
@@ -225,6 +225,7 @@ ion-checkbox,css-prop,--border-radius
 ion-checkbox,css-prop,--border-style
 ion-checkbox,css-prop,--border-width
 ion-checkbox,css-prop,--checkmark-color
+ion-checkbox,css-prop,--checkmark-width
 ion-checkbox,css-prop,--size
 ion-checkbox,css-prop,--transition
 
diff --git a/core/src/components/checkbox/checkbox.md.scss b/core/src/components/checkbox/checkbox.md.scss
index ed49019846..0c3b6e9a77 100644
--- a/core/src/components/checkbox/checkbox.md.scss
+++ b/core/src/components/checkbox/checkbox.md.scss
@@ -10,6 +10,7 @@
   --border-width: #{$checkbox-md-icon-border-width};
   --border-style: #{$checkbox-md-icon-border-style};
   --border-color: #{$checkbox-md-icon-border-color-off};
+  --checkmark-width: 3;
 
   // Background
   --background: #{$checkbox-md-icon-background-color-off};
@@ -27,7 +28,6 @@
 .checkbox-icon path {
   stroke-dasharray: 30;
   stroke-dashoffset: 30;
-  stroke-width: 3;
 }
 
 // Material Design Checkbox: Checked / Indeterminate
diff --git a/core/src/components/checkbox/checkbox.scss b/core/src/components/checkbox/checkbox.scss
index d18cc2fcb9..2af31588e0 100644
--- a/core/src/components/checkbox/checkbox.scss
+++ b/core/src/components/checkbox/checkbox.scss
@@ -19,10 +19,12 @@
    * @prop --transition: Transition of the checkbox icon
    *
    * @prop --checkmark-color: Color of the checkbox checkmark when checked
+   * @prop --checkmark-width: Stroke width of the checkbox checkmark
    */
   --background-checked: #{ion-color(primary, base)};
   --border-color-checked: #{ion-color(primary, base)};
   --checkmark-color: #{ion-color(primary, contrast)};
+  --checkmark-width: 1;
   --transition: none;
 
   display: inline-block;
@@ -65,7 +67,7 @@ button {
 .checkbox-icon path {
   fill: none;
   stroke: var(--checkmark-color);
-  stroke-width: 1;
+  stroke-width: var(--checkmark-width);
 
   opacity: 0;
 }
diff --git a/core/src/components/checkbox/readme.md b/core/src/components/checkbox/readme.md
index 094d573e6b..9fe619b517 100644
--- a/core/src/components/checkbox/readme.md
+++ b/core/src/components/checkbox/readme.md
@@ -218,6 +218,7 @@ export const CheckboxExample: React.FC = () => (
 | `--border-style`         | Border style of the checkbox icon              |
 | `--border-width`         | Border width of the checkbox icon              |
 | `--checkmark-color`      | Color of the checkbox checkmark when checked   |
+| `--checkmark-width`      | Stroke width of the checkbox checkmark         |
 | `--size`                 | Size of the checkbox icon                      |
 | `--transition`           | Transition of the checkbox icon                |
 
diff --git a/core/src/components/checkbox/test/basic/index.html b/core/src/components/checkbox/test/basic/index.html
index 6ed2ee8ab0..69634c0249 100644
--- a/core/src/components/checkbox/test/basic/index.html
+++ b/core/src/components/checkbox/test/basic/index.html
@@ -76,6 +76,11 @@
         <ion-checkbox checked color="dark" slot="start" style="--size: 100px;"></ion-checkbox>
       </ion-item>
 
+      <ion-item>
+        <ion-label>Checkmark width</ion-label>
+        <ion-checkbox checked color="dark" slot="start" style="--checkmark-width: 7;"></ion-checkbox>
+      </ion-item>
+
       <ion-item>
         <ion-label>Unchecked by Default</ion-label>
         <ion-checkbox></ion-checkbox>