My Big Fat Obnoxious Fiance is an American reality television series broadcast by the Fox Broadcasting Company (Fox). The six-episode series premiered on January 19, 2004, and concluded on February 23, 2004. Filmed in Los Angeles, California, the series followed Randi Coy, a 23-year-old teacher, in competition for a $1,000,000 reward. In order to win the reward, Coy was required to convince her family and friends that she was engaged to and planned to elope with Steven Williams, an ill-mannered 29-year-old man. If any of Coy's family members refused to attend her wedding or objected during the ceremony, Coy would lose the competition. Coy was under the impression that Williams was another contestant competing for a monetary reward, however, he was actually Steven Bailey, an actor hired to thwart her attempt to win the competition. The series was hosted by Canadian actor Claudia DiFolco.

My Big Fat Obnoxious Fiance received mixed reception from television critics; some critics found the series entertaining while others believed the premise was contrived. The series garnered high ratings and was one of the top viewed reality television programs of the 2003–04 television season. While the series did not spawn a second season, its success resulted in a 2004 spin-off titled My Big Fat Obnoxious Boss. In 2005, My Big Fat Obnoxious Fiance was one of several television programs cited in a class-action lawsuit filed by the Writers Guild of America concerning labor law violations.