John Cowan (born August 24, 1953) is an American progressive bluegrass vocalist and bass guitar player.

His song "Can't Stand To Lose", co-written with Rusty Young, was featured on the Doobies' 2000 album Sibling Rivalry.

In addition, throughout the 1990s, Cowan picked up session work singing harmony vocals and/or playing bass on recordings of Travis Tritt, Steve Earle, Garth Brooks and Wynonna.

'[7][citation needed] In May 2010, Cowan rejoined The Doobie Brothers as their touring bass player (after their regular bassist, Skylark, suffered a stroke).

In 2017, he released an album with fellow Doobie Brother Ed Toth and Chicago guitarist Keith Howland titled Button.