Donna Jean Thatcher Godchaux-MacKay (born August 22, 1947) is an American singer, best known for having been a member of the Grateful Dead from 1972 until 1979.

Donna Jean Thatcher was born in Florence, Alabama. Prior to 1970, she had worked as a session singer in Muscle Shoals, Alabama, eventually singing with a group called Southern Comfort and appearing as a backup singer on at least two #1 hit songs: “When a Man Loves a Woman” by Percy Sledge in 1966 and “Suspicious Minds” by Elvis Presley in 1969. Her vocals were featured on other classic recordings by Boz Scaggs and Duane Allman, Cher, Joe Tex, Neil Diamond and many others. She then moved to California and met future fellow Grateful Dead member Keith Godchaux, whom she married in 1970.