Clarence T. "Cack" Henley (June 21, 1884 – July 9, 1929) was an American professional baseball pitcher.

He played for the San Francisco Seals and Venice / Vernon Tigers of the Pacific Coast League from 1905 to 1915.

[2] Henley joined the San Francisco Seals of the Pacific Coast League in 1905.

[7] After the 1913 season, San Francisco traded Henley and Roy McArdle to the Venice Tigers for Spider Baum.

[12] After he retired from baseball, Henley drove a school bus in Fruitridge Pocket, California.