Bunk Gardner (born John Leon Guarnera; May 2, 1933 in Cleveland, Ohio) is an American musician who most notably played for the original version of Frank Zappa's Mothers of Invention until the group disbanded in 1969.

By late 1966 Gardner had joined Frank Zappa & the Mothers of Invention, playing tenor sax and other woodwinds.

In late 1968 his brother Buzz Gardner joined the Mothers, staying until the group disbanded a year later.

Gardner has done a few projects with Don Preston, a member of the Mothers, making a few albums and touring with him.

From 2003 to 2009, Gardner was a member of the Los Feliz Woodwind Ensemble with founder Kalman Bloch and Michele Zukovsky.