Rachel Alexandra is a retired American Thoroughbred racehorse and the 2009 Horse of the Year. When she won the 2009 Preakness Stakes, the second leg of the Triple Crown, she became the first filly to win the race in 85 years. She also won races in six states, on eight different tracks, against fillies and Grade 1 colts and older horses, achieving a long string of consecutive wins including numerous Grade 1 stakes. Rachel Alexandra neared or broke multiple stakes records, track records and winning margin records throughout her career. On September 28, 2010, owner Jess Jackson announced Rachel Alexandra's retirement. She was bred to 2007–2008 Horse of the Year Curlin and delivered a colt on January 22, 2012.

The 2009 Preakness Stakes was the 134th running of the Preakness Stakes, the second leg of horse racing's Triple Crown. The value of the race was $1,100,000 in stakes. The race was sponsored by BlackBerry and hence officially was called BlackBerry Preakness Stakes. The race took place on May 16, 2009. Post time was 6:19 p.m. EDT and was televised in the United States on the NBC television networks. The Maryland Jockey Club reported total attendance of 77,850, this is recorded as third highest on the list of American thoroughbred racing top attended events for North America in 2009.