David Lynn Thomas (born 1953 in Miami, Florida) is an American singer, songwriter and musician.

He was one of the founding members of the short-lived proto-punkers Rocket from the Tombs (1974–1975), where he went by the name of Crocus Behemoth, and of punk group Pere Ubu (1975–present, intermittently). He has also released several solo albums. Though primarily a singer, he sometimes plays melodeon, trombone, guitar or other instruments.