David "Happy" Williams (born September 17, 1946), is a US-based Trinidadian jazz double-bassist, who has been a long-time member of Cedar Walton's group. Williams has also worked with many other notable musicians, including Woody Shaw, Bobby Hutcherson, Stan Getz, Kenny Barron, Duke Jordan, Monty Alexander, Frank Morgan, Hank Jones, Charles McPherson, Larry Willis, George Cables, Abdullah Ibrahim, David "Fathead" Newman, Sonny Fortune, John Hicks, Louis Hayes, Jackie McLean, Clifford Jordan, Abbey Lincoln, Ernestine Anderson, and Kathleen Battle.