Claude Preston "Lefty" Williams (March 9, 1893 – November 4, 1959) was an American pitcher in Major League Baseball.

That year, he pitched 418.2 innings, leading the league in wins (33) and strikeouts (294), while featuring mostly his mid-90s fastball and swooping curve.

However, before that year's World Series, he was involved in the Black Sox Scandal when teammate Chick Gandil offered him $10,000 to lose his starts.

Though acquitted by a jury, Williams and the seven other "Black Sox" were banned from organized baseball by Commissioner Kenesaw Mountain Landis.

Williams spent his later years in Laguna Beach, California where he died in 1959, operating a garden nursery business.