John Christianson (born 1975) is one of the current trumpet players in the California-based ska punk band, Reel Big Fish in which his nickname is "Little Johnny Christmas."
He played trumpet in California-based ska punk band The Forces of Evil under the name John Evil before they disbanded. John is also the only current member of Reel Big Fish that graduated from college. When called upon, he does repairs on the band's brass instruments.
On the commentary for the Reel Big Fish Live DVD Our Live Album Is Better Than Your Live Album, John stated that he featured in the sci-fi comedy film Galaxy Quest. However, he is not mentioned on the full cast credits for the film.