BotCon, briefly known as "The Official Transformers Collectors' Convention" (or OTFCC), is an annual convention for Transformers fans and collectors. BotCon has been held annually since 1994. BotCon is a syllabic abbreviation for "Robot Convention" but also refers to "Autobot" and "Decepticon", the protagonist and antagonist robot factions in the many continuities in the Transformers franchise.

Featured BotCon guests are usually involved in the creation of Transformers media in some respect, whether as voice actors from the animated series, artists or writers from the comic books, or actual Hasbro employees. Fun Publications has held the convention for a number of years, with 2016 being its final year. It was replaced by the now defunct HasCon, Hasbro's own convention, in 2017.

The first BotCon was held in Fort Wayne, Indiana, United States in 1994. Organized by brothers Jon and Karl Hartman, the convention had 180 attendees. BotCon was organized in 1995 by Raksha, a prominent figure in the fan community, and in 1996 by Men In Black Productions, headed up by Dennis Barger. In 1997, the Hartmans brought Glen Hallit, a fellow fan, into the fold, forming 3H Enterprises (based on the first letter of the organizers' last names).

In 1999, BotCon Europe took place in Clapham Common, Wandsworth, South West London, England.

At BotCon 2002, Hallit announced that 3H had secured the official Transformers convention license, as well as licenses to produce comic books and start a fan club. Shortly thereafter, the Hartmans were removed from their organizational duties, leaving Glen Hallit as the sole organizer of the new company, 3H Productions, Inc.

In the winter of 2002, 3H sought to expand to Europe, holding an official European convention in Cheshunt, UK. However, the event, which was held in conjunction with the main BotCon 2002 in the US, had much less advertising and the registration did not open until a couple of weeks before the convention. Since the attendance at the European BotCon had been much smaller than the main show that summer, 3H decided it was too much work to hold two separate conventions, and officially announced that they would never hold BotCon outside the US again.

In 2003, the convention changed its name to "The Official Transformers Collectors' Convention" (OTFCC), due to the Hartmans' ownership of the BotCon service mark. The fandom held dueling conventions in 2004, as 3H held OTFCC in Chicago, Illinois, while the Hartman brothers revived the BotCon name for their final convention in Pasadena, California. That fall, 3H Productions lost all of its Transformers-related licenses, leaving the convention in a state of limbo.

In early January 2005, Hasbro announced on its official website that Fun Publications, owned by Brian Savage, had been awarded the convention and fan club licenses. The Hartman brothers and prominent fans Pete Sinclair, Benson Yee, and Rik Alvarez were invited to form an advisory council to help ease the transition of organizing the convention for the new owners. Once the Hartmans' service mark was transferred to Fun Publications, BotCon regained its status of being the official Transformers collectors' convention.