Jeffrey Alan Winkless (June 2, 1941 - June 26, 2006) was an American film and voice actor and music composer.

He was born in Springfield, Massachusetts.

One of his younger brothers, Daniel Owen Winkless, worked with him on The Banana Splits Adventure Hour. He was also credited as Jeffrey Brock.

He has done voice-overs for several anime titles dubbed by Streamline Pictures including Doomed Megalopolis, Space Adventure Cobra, Vampire Hunter D, Crying Freeman and Lily C.A.T..

Winkless died of a brain tumor on June 26, 2006, 24 days after his 65th birthday. He is survived by his three brothers and Rayonelle Baldwin (his wife).