Guy Klucevsek (born February 26, 1947) is an American-born accordionist and composer.

Klucevsek is one of relatively few accordion players active in jazz and free improvisation.

He has released sixteen albums as a leader or co-leader, and has recorded or performed with Dave Douglas, John Zorn, Bill Frisell, Laurie Anderson and others. He is also a member of the international group Accordion Tribe.