diff --git a/PhpCollective/Sniffs/PHP/VoidCastSniff.php b/PhpCollective/Sniffs/PHP/VoidCastSniff.php
new file mode 100644
index 0000000..0e25f68
--- /dev/null
+++ b/PhpCollective/Sniffs/PHP/VoidCastSniff.php
@@ -0,0 +1,183 @@
+<?php
+
+/**
+ * MIT License
+ * For full license information, please view the LICENSE file that was distributed with this source code.
+ */
+
+namespace PhpCollective\Sniffs\PHP;
+
+use PHP_CodeSniffer\Files\File;
+use PHP_CodeSniffer\Sniffs\Sniff;
+use PHP_CodeSniffer\Util\Tokens;
+
+/**
+ * Validates (void) cast usage - a PHP 8.5 feature.
+ *
+ * Ensures proper spacing and formatting around void casts.
+ */
+class VoidCastSniff implements Sniff
+{
+    /**
+     * @inheritDoc
+     */
+    public function register(): array
+    {
+        return [T_OPEN_PARENTHESIS];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function process(File $phpcsFile, $stackPtr): void
+    {
+        $tokens = $phpcsFile->getTokens();
+
+        // Check if this is a (void) cast pattern
+        $nextNonWhitespace = $phpcsFile->findNext(Tokens::$emptyTokens, $stackPtr + 1, null, true);
+        if (!$nextNonWhitespace || $tokens[$nextNonWhitespace]['code'] !== T_STRING) {
+            return;
+        }
+
+        if (strtolower($tokens[$nextNonWhitespace]['content']) !== 'void') {
+            return;
+        }
+
+        $closeParenthesis = $phpcsFile->findNext(Tokens::$emptyTokens, $nextNonWhitespace + 1, null, true);
+        if (!$closeParenthesis || $tokens[$closeParenthesis]['code'] !== T_CLOSE_PARENTHESIS) {
+            return;
+        }
+
+        // We have a (void) cast - check spacing
+        $this->checkSpacingBeforeCast($phpcsFile, $stackPtr);
+        $this->checkSpacingWithinCast($phpcsFile, $stackPtr, $nextNonWhitespace, $closeParenthesis);
+        $this->checkSpacingAfterCast($phpcsFile, $closeParenthesis);
+    }
+
+    /**
+     * Check that there's no space before the opening parenthesis of the cast
+     *
+     * @param \PHP_CodeSniffer\Files\File $phpcsFile
+     * @param int $stackPtr
+     *
+     * @return void
+     */
+    protected function checkSpacingBeforeCast(File $phpcsFile, int $stackPtr): void
+    {
+        $tokens = $phpcsFile->getTokens();
+
+        // Check if previous token is whitespace at statement start, which is OK
+        $prevIndex = $phpcsFile->findPrevious(Tokens::$emptyTokens, $stackPtr - 1, null, true);
+        if (!$prevIndex) {
+            return;
+        }
+
+        // If there's whitespace before the cast and we're not at statement start, it might be intentional
+        // We mainly want to avoid cases like `foo (void)bar()`
+        if ($tokens[$stackPtr - 1]['code'] === T_WHITESPACE) {
+            $prevToken = $tokens[$prevIndex];
+            // Only warn if the previous non-whitespace token suggests this is mid-expression
+            if (
+                in_array($prevToken['code'], [T_STRING, T_VARIABLE, T_CLOSE_PARENTHESIS, T_CLOSE_SQUARE_BRACKET], true)
+                && $prevToken['line'] === $tokens[$stackPtr]['line']
+            ) {
+                $fix = $phpcsFile->addFixableError(
+                    'No space expected before void cast',
+                    $stackPtr - 1,
+                    'SpaceBeforeCast',
+                );
+                if ($fix) {
+                    $phpcsFile->fixer->replaceToken($stackPtr - 1, '');
+                }
+            }
+        }
+    }
+
+    /**
+     * Check that there's no space within the cast (void) not ( void )
+     *
+     * @param \PHP_CodeSniffer\Files\File $phpcsFile
+     * @param int $openParen
+     * @param int $voidToken
+     * @param int $closeParen
+     *
+     * @return void
+     */
+    protected function checkSpacingWithinCast(File $phpcsFile, int $openParen, int $voidToken, int $closeParen): void
+    {
+        $tokens = $phpcsFile->getTokens();
+
+        // Check space after opening parenthesis
+        if ($voidToken !== $openParen + 1) {
+            $fix = $phpcsFile->addFixableError(
+                'No space expected after opening parenthesis in void cast',
+                $openParen + 1,
+                'SpaceAfterOpenParen',
+            );
+            if ($fix) {
+                for ($i = $openParen + 1; $i < $voidToken; $i++) {
+                    $phpcsFile->fixer->replaceToken($i, '');
+                }
+            }
+        }
+
+        // Check space before closing parenthesis
+        if ($closeParen !== $voidToken + 1) {
+            $fix = $phpcsFile->addFixableError(
+                'No space expected before closing parenthesis in void cast',
+                $voidToken + 1,
+                'SpaceBeforeCloseParen',
+            );
+            if ($fix) {
+                for ($i = $voidToken + 1; $i < $closeParen; $i++) {
+                    $phpcsFile->fixer->replaceToken($i, '');
+                }
+            }
+        }
+    }
+
+    /**
+     * Check that there's exactly one space after the cast
+     *
+     * @param \PHP_CodeSniffer\Files\File $phpcsFile
+     * @param int $closeParen
+     *
+     * @return void
+     */
+    protected function checkSpacingAfterCast(File $phpcsFile, int $closeParen): void
+    {
+        $tokens = $phpcsFile->getTokens();
+
+        $nextToken = $closeParen + 1;
+        if (!isset($tokens[$nextToken])) {
+            return;
+        }
+
+        if ($tokens[$nextToken]['code'] !== T_WHITESPACE) {
+            $fix = $phpcsFile->addFixableError(
+                'Expected 1 space after void cast, but 0 found',
+                $closeParen,
+                'MissingSpaceAfter',
+            );
+            if ($fix) {
+                $phpcsFile->fixer->addContent($closeParen, ' ');
+            }
+        } else {
+            $nextNonWhitespace = $phpcsFile->findNext(Tokens::$emptyTokens, $nextToken, null, true);
+            if ($nextNonWhitespace && $tokens[$nextNonWhitespace]['line'] === $tokens[$closeParen]['line']) {
+                // Same line - should be exactly one space
+                if ($tokens[$nextToken]['content'] !== ' ') {
+                    $fix = $phpcsFile->addFixableError(
+                        'Expected 1 space after void cast, but %d found',
+                        $nextToken,
+                        'TooManySpacesAfter',
+                        [strlen($tokens[$nextToken]['content'])],
+                    );
+                    if ($fix) {
+                        $phpcsFile->fixer->replaceToken($nextToken, ' ');
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/tests/PhpCollective/Sniffs/PHP/VoidCastSniffTest.php b/tests/PhpCollective/Sniffs/PHP/VoidCastSniffTest.php
new file mode 100644
index 0000000..1c68c75
--- /dev/null
+++ b/tests/PhpCollective/Sniffs/PHP/VoidCastSniffTest.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * MIT License
+ * For full license information, please view the LICENSE file that was distributed with this source code.
+ */
+
+namespace PhpCollective\Test\PhpCollective\Sniffs\PHP;
+
+use PhpCollective\Sniffs\PHP\VoidCastSniff;
+use PhpCollective\Test\TestCase;
+
+class VoidCastSniffTest extends TestCase
+{
+    /**
+     * @return void
+     */
+    public function testVoidCastSniffer(): void
+    {
+        $this->assertSnifferFindsFixableErrors(new VoidCastSniff(), 7, 7);
+    }
+
+    /**
+     * @return void
+     */
+    public function testVoidCastFixer(): void
+    {
+        $this->assertSnifferCanFixErrors(new VoidCastSniff(), 7);
+    }
+}
diff --git a/tests/_data/VoidCast/after.php b/tests/_data/VoidCast/after.php
new file mode 100644
index 0000000..c6e1965
--- /dev/null
+++ b/tests/_data/VoidCast/after.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCollective;
+
+class VoidCastExample
+{
+    public function testVoidCast(): void
+    {
+        // Correct usage
+        (void) $this->methodWithReturn();
+
+        // Missing space after cast
+        (void) $this->anotherMethod();
+
+        // Space inside cast
+        (void) $this->yetAnotherMethod();
+
+        // Extra spaces after cast
+        (void) $this->oneMoreMethod();
+
+        // Combination of issues
+        (void) $this->finalMethod();
+    }
+
+    private function methodWithReturn(): string
+    {
+        return 'result';
+    }
+
+    private function anotherMethod(): int
+    {
+        return 42;
+    }
+
+    private function yetAnotherMethod(): bool
+    {
+        return true;
+    }
+
+    private function oneMoreMethod(): array
+    {
+        return [];
+    }
+
+    private function finalMethod(): mixed
+    {
+        return null;
+    }
+}
diff --git a/tests/_data/VoidCast/before.php b/tests/_data/VoidCast/before.php
new file mode 100644
index 0000000..bba668d
--- /dev/null
+++ b/tests/_data/VoidCast/before.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpCollective;
+
+class VoidCastExample
+{
+    public function testVoidCast(): void
+    {
+        // Correct usage
+        (void) $this->methodWithReturn();
+
+        // Missing space after cast
+        (void)$this->anotherMethod();
+
+        // Space inside cast
+        ( void ) $this->yetAnotherMethod();
+
+        // Extra spaces after cast
+        (void)  $this->oneMoreMethod();
+
+        // Combination of issues
+        ( void )$this->finalMethod();
+    }
+
+    private function methodWithReturn(): string
+    {
+        return 'result';
+    }
+
+    private function anotherMethod(): int
+    {
+        return 42;
+    }
+
+    private function yetAnotherMethod(): bool
+    {
+        return true;
+    }
+
+    private function oneMoreMethod(): array
+    {
+        return [];
+    }
+
+    private function finalMethod(): mixed
+    {
+        return null;
+    }
+}