diff --git a/src/Symfony/Component/ExpressionLanguage/CHANGELOG.md b/src/Symfony/Component/ExpressionLanguage/CHANGELOG.md
index 4331d722d0457..26090043fdba3 100644
--- a/src/Symfony/Component/ExpressionLanguage/CHANGELOG.md
+++ b/src/Symfony/Component/ExpressionLanguage/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 ---
 
  * Add support for null-coalescing unknown variables
+ * Add support for comments using `/*` & `*/`
 
 7.1
 ---
diff --git a/src/Symfony/Component/ExpressionLanguage/Lexer.php b/src/Symfony/Component/ExpressionLanguage/Lexer.php
index ab32342844cdf..4549dc5abbdc5 100644
--- a/src/Symfony/Component/ExpressionLanguage/Lexer.php
+++ b/src/Symfony/Component/ExpressionLanguage/Lexer.php
@@ -69,6 +69,9 @@ public function tokenize(string $expression): TokenStream
                 // strings
                 $tokens[] = new Token(Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)), $cursor + 1);
                 $cursor += \strlen($match[0]);
+            } elseif (preg_match('{/\*.*?\*/}A', $expression, $match, 0, $cursor)) {
+                // comments
+                $cursor += \strlen($match[0]);
             } elseif (preg_match('/(?<=^|[\s(])starts with(?=[\s(])|(?<=^|[\s(])ends with(?=[\s(])|(?<=^|[\s(])contains(?=[\s(])|(?<=^|[\s(])matches(?=[\s(])|(?<=^|[\s(])not in(?=[\s(])|(?<=^|[\s(])not(?=[\s(])|(?<=^|[\s(])and(?=[\s(])|\=\=\=|\!\=\=|(?<=^|[\s(])or(?=[\s(])|\|\||&&|\=\=|\!\=|\>\=|\<\=|(?<=^|[\s(])in(?=[\s(])|\.\.|\*\*|\!|\||\^|&|\<|\>|\+|\-|~|\*|\/|%/A', $expression, $match, 0, $cursor)) {
                 // operators
                 $tokens[] = new Token(Token::OPERATOR_TYPE, $match[0], $cursor + 1);
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php
index fbd50c9117c07..0ab96202d5a7e 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php
@@ -459,6 +459,43 @@ public function testRegisterAfterCompile($registerCallback)
         $registerCallback($el);
     }
 
+    public static function validCommentProvider()
+    {
+        yield ['1 /* comment */ + 1'];
+        yield ['1 /* /* comment with spaces */'];
+        yield ['1 /** extra stars **/ + 1'];
+        yield ["/* multi\nline */ 'foo'"];
+    }
+
+    /**
+     * @dataProvider validCommentProvider
+     */
+    public function testLintAllowsComments($expression)
+    {
+        $el = new ExpressionLanguage();
+        $el->lint($expression, []);
+
+        $this->expectNotToPerformAssertions();
+    }
+
+    public static function invalidCommentProvider()
+    {
+        yield ['1 + no start */'];
+        yield ['1 /* no closing'];
+        yield ['1 /* double closing */ */'];
+    }
+
+    /**
+     * @dataProvider invalidCommentProvider
+     */
+    public function testLintThrowsOnInvalidComments($expression)
+    {
+        $el = new ExpressionLanguage();
+
+        $this->expectException(SyntaxError::class);
+        $el->lint($expression, []);
+    }
+
     public function testLintDoesntThrowOnValidExpression()
     {
         $el = new ExpressionLanguage();
@@ -477,6 +514,13 @@ public function testLintThrowsOnInvalidExpression()
         $el->lint('node.', ['node']);
     }
 
+    public function testCommentsIgnored()
+    {
+        $expressionLanguage = new ExpressionLanguage();
+        $this->assertSame(3, $expressionLanguage->evaluate('1 /* foo */ + 2'));
+        $this->assertSame('(1 + 2)', $expressionLanguage->compile('1 /* foo */ + 2'));
+    }
+
     public static function getRegisterCallbacks()
     {
         return [
diff --git a/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php b/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php
index b1962b51d0a47..2ffe988b296e9 100644
--- a/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php
+++ b/src/Symfony/Component/ExpressionLanguage/Tests/LexerTest.php
@@ -151,6 +151,34 @@ public static function getTokenizeData()
                 ],
                 '-.7_189e+10',
             ],
+            [
+                [
+                    new Token('number', 65536, 1),
+                ],
+                '65536 /* this is 2^16 */',
+            ],
+            [
+                [
+                    new Token('number', 2, 1),
+                    new Token('operator', '*', 21),
+                    new Token('number', 4, 23),
+                ],
+                '2 /* /* comment1 */ * 4',
+            ],
+            [
+                [
+                    new Token('string', '/* this is', 1),
+                    new Token('operator', '~', 14),
+                    new Token('string', 'not a comment */', 16),
+                ],
+                '"/* this is" ~ "not a comment */"',
+            ],
+            [
+                [
+                    new Token('string', '/* this is not a comment */', 1),
+                ],
+                '"/* this is not a comment */"',
+            ],
         ];
     }
 }