Temper! is a science fiction fanzine edited by Dan Zissman, Judy Zissman, later known as Judith Merril, and Damon Knight.
Subtitled "The Family Magazine", Temper! was published by Parallax in May 1945, in New York, U.S.A. only one issue was released.
Damon Knight's contribution is entitled "On Hood River, Oregon", in which he mockingly describes the residents of his home town as illiterate utra-conservative hillbillies. There is also a discussion of the Vanguard Prospectus.
In the same year, Dan and Judy Zissman, in collaboration with Larry Shaw, also published the fanzine Science*Fiction.