UFC 65: Bad Intentions was a mixed martial arts competition held by the Ultimate Fighting Championship on November 18, 2006, at the ARCO Arena in Sacramento, California – the UFC's first show at this venue. It was broadcast live on pay-per-view in the United States and Canada, and was later released on DVD.

ARCO Arena was an indoor arena located in Sacramento, California, United States. Opened in 1988, it was the home of the Sacramento Kings of the National Basketball Association (NBA) from 1988 to 2016. It hosted nearly 200 spectator events each year. The arena was named for ARCO, at the time in 1988, a Los Angeles-based independent oil and gas company that today is now a brand owned by Findlay, Ohio-based Marathon Petroleum. It was later named for Sleep Train, a chain of mattress and bed retailers based in Rocklin, California, that at the time of the agreement was a subsidiary of Mattress Firm, a Houston-based retailer that has since re-branded all Sleep Train stores as Mattress Firm. Several major entertainers have performed at the venue before its closure including Bruno Mars and Linkin Park.