Douglas Ray "Cosmo" Clifford (born April 24, 1945 in Palo Alto, California) is an American rock drummer best known as a founding member of Creedence Clearwater Revival. After the group dissolved in the early 1970s, Clifford released a solo album and later joined CCR bassist Stu Cook in the Don Harrison Band. In 1995, Clifford and Cook formed the band Creedence Clearwater Revisited, performing live versions of Creedence Clearwater Revival songs.