David "Happy" Williams (born September 17, 1946[1]), is a US-based Trinidadian jazz double-bassist, who was 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.

"[9] Williams went to New York City in 1969 on what was intended to be a two-week visit but decided to stay on when he was offered work after sitting in on a gig with Grachan Moncur in place of Jimmy Garrison.

[2] Williams' first album as a leader, Soul is Free, was released in 1979; one of the compositions from it, "Out of the Sheets, Into the Streets", was used in the 1983 Eddie Murphy film Trading Places.

[15] With Herb Alpert and Hugh Masekela With Kenny Barron With David Benoit With The Blackbyrds With George Cables With Michael Carvin With Cyrus Chestnut With Freddy Cole With Charles Davis With Roberta Flack With Sonny Fortune With Steve Grossman With Slide Hampton With Louis Hayes With David Hazeltine With Billy Higgins With Terumasa Hino With Freddie Hubbard With Abdullah Ibrahim With Jermaine Jackson With Elvin Jones With Sam Jones With Clifford Jordan With Duke Jordan With Joyce With David Lasley With Liberace With Warne Marsh With Jackie McLean With Charles McPherson With James Moody, Clark Terry and Elvin Jones With Frank Morgan With David "Fathead" Newman With One for All With Art Pepper With Dave Pike With Ernest Ranglin With Vanessa Rubin With Janis Siegel With the Voices of East Harlem With Cedar Walton With Larry Willis