David Knights (born David John Knights, 28 June 1945, Islington, North London) was the original bass guitarist in Procol Harum. He played bass on the hit single "A Whiter Shade of Pale".  He was in the band long enough to play on their first three albums. He departed in 1969, to be replaced by Chris Copping. When he was in Procol Harum he used a Gibson EB-0 bass.
He has since formed the band named Ruby, that released one album before disbanding. He also produced a single for Mickey Jupp's Legend group. He is fairly inactive in the music industry these days.