Duane Charles Theiss (born November 20, 1953) is a former Major League Baseball pitcher.

He played two seasons with the Atlanta Braves from 1977 to 1978.

[1] Theiss attended Sheridan High School (Thornville, Ohio) then Marietta College, and in 1974 he played collegiate summer baseball with the Wareham Gatemen of the Cape Cod Baseball League.

[2] He was drafted in the 12th round of the 1975 MLB Draft by the Braves.

This biographical article relating to an American baseball pitcher born in the 1950s is a stub.