diff --git a/src/Twig/Runtime/IconRuntime.php b/src/Twig/Runtime/IconRuntime.php
index a4e906b..d51031d 100644
--- a/src/Twig/Runtime/IconRuntime.php
+++ b/src/Twig/Runtime/IconRuntime.php
@@ -62,8 +62,11 @@ final class IconRuntime implements RuntimeExtensionInterface
         $classes = trim($colourClasses.' '.$extraClasses);
         $this->addClassesToSvg($svg, $classes);
 
+        $svg = $this->addAttribute($svg, 'aria-hidden', 'true');
+
         if (null !== $options['title']) {
             $this->addTitleToSvg($svg, $options['title']);
+            $svg = $this->addAttribute($svg, 'aria-hidden', 'false');
         }
 
         $this->setSvgHeightAndWidth($svg, $options['size']);
@@ -217,6 +220,14 @@ final class IconRuntime implements RuntimeExtensionInterface
         $svg = $this->removeXMLDeclaration($svgAsXml->saveXML());
     }
 
+    private function addAttribute(string $svg, string $attribute, string $value): string
+    {
+        $xml = new \SimpleXMLElement($svg);
+        $xml = $this->addAttributeToXmlElement($xml, $attribute, $value);
+
+        return $this->removeXMLDeclaration($xml->saveXML());
+    }
+
     private function isValidXml(string $input): bool
     {
         try {
diff --git a/tests/Twig/Runtime/IconRuntimeTest.php b/tests/Twig/Runtime/IconRuntimeTest.php
index 165a845..a090e6d 100644
--- a/tests/Twig/Runtime/IconRuntimeTest.php
+++ b/tests/Twig/Runtime/IconRuntimeTest.php
@@ -280,4 +280,23 @@ class IconRuntimeTest extends TestCase
         $this->assertStringNotContainsString($needleA, $contents);
         $this->assertStringNotContainsString($needleB, $contents);
     }
+
+    public function testAriaHiddenAttributeIsAdded(): void
+    {
+        $contents = $this->icon->renderIcon(['icon' => self::ICON]);
+        $this->assertMatchesRegularExpression('/<svg.+aria-hidden="true".*>/', $contents);
+    }
+
+    public function testAriaHiddenAttributeIsSetToTrueIfAlreadyPresent(): void
+    {
+        $contents = $this->icon->renderIcon(['icon' => 'attr']);
+        $this->assertMatchesRegularExpression('/<svg.+aria-hidden="true".*>/', $contents);
+        $this->assertDoesNotMatchRegularExpression('/<svg.+aria-hidden="false".*>/', $contents);
+    }
+
+    public function testAriaHiddenAttributeIsSetToFalseIfATitleIsPassedIn(): void
+    {
+        $contents = $this->icon->renderIcon(['icon' => self::ICON, 'title' => 'something']);
+        $this->assertMatchesRegularExpression('/<svg.+aria-hidden="false".*>/', $contents);
+    }
 }