Phoenix Fan Fusion is a speculative fiction entertainment and comic book convention held annually in Phoenix, Arizona. It was founded as the Phoenix Cactus Comicon in June 2002, and originally consisted of a one-day six-hour event held in Ahwatukee, Arizona. The convention plays host to comic related panels, programming events, art contests, and autograph signings for all ages. It is a three-day event (Friday-Sunday) held during the summer at the Phoenix Convention Center in downtown Phoenix. On Thursday evening prior to the official opening of the event, there is a preview for professionals, exhibitors, and select guests pre-registered for all four days.

A comic book convention or comic con is a fan convention with a primary focus on comic books and comic book culture, in which comic book fans gather to meet creators, experts, and each other. Commonly, comic conventions are multi-day events hosted at convention centers, hotels, or college campuses. They feature a wide variety of activities and panels, with a larger number of attendees participating in cosplay than most other types of fan conventions. Comic book conventions are also used as a vehicle for industry, in which publishers, distributors, and retailers represent their comic-related releases. Comic book conventions may be considered derivatives of science-fiction conventions, which began in the late 1930s.