Majestic Roi (foaled 13 April 2004) is an American-bred, British-trained Thoroughbred racehorse and broodmare. She showed promise as a two-year-old in 2006, winning a maiden race on her second appearance and in the following spring she made an immediate impact with an upset victory in the Fred Darling Stakes. She subsequently finished second in the Prix de Sandringham but was well beaten in her next three races before ending her season with a career-best performance to win the Group One Sun Chariot Stakes at odds of 16/1. She raced eight times without success in 2008 before being retired from the track. She has had some success as a dam of winners.