Opera House (February 24, 1988 – April 20, 2016) was a British thoroughbred racehorse and sire. In a racing career which lasted from October 1990 until November 1993 he ran eighteen times and won eight races. Opera House was best known for his performances as a five-year-old in 1993, when he won three Group One races, including the King George VI and Queen Elizabeth Stakes and was named European Champion Older Horse. Retired to stud in Japan, he developed into a top-class sire in the country, supplying seven-time Grade 1 winner T. M. Opera O, four-time Group 1 winner Meisho Samson and multiple Group scorer Miyabi Ranveli.

Opera House, a bay horse with a white star, was bred by the Meon Valley Stud in Hampshire. He was sired by Sadler's Wells, out of Colorspin, a daughter of High Top. Sadler's Wells (1981–2011) won three Group One races in 1984 and went on to sire the winners of over 2,000 races including more than 130 at Group One/Grade I level. He was the most successful sire in the history of British racing being the leading Leading sire in Great Britain and Ireland a record fourteen times. Colorspin won the Irish Oaks and was a half-sister of the Prix de l'Opéra winner Bella Colora and the Irish Champion Stakes winner Cezanne. Apart from Opera House, she also produced his full brother, the champion stayer Kayf Tara and the Prix de l'Opéra winner Zee Zee Top.

Opera House raced in the colours of Sheikh Mohammed and was trained throughout his career by Michael Stoute at Newmarket, Suffolk. His most regular jockeys were Steve Cauthen and Michael Roberts.

Opera House did not appear on a racecourse until the Autumn of 1990. At Leicester in October he started odds on for an eleven-runner maiden race and pulled clear in the closing stages to win by ten lengths.

Shortly after the race, Opera House was exercising at Newmarket when he tripped and fell on a road. He sustained a fracture to his pastern which put his career in jeopardy and kept him of the course for eleven months.

Opera House's three-year-old debut was delayed by his recuperation from injury and he did not race until September, when he won a three-runner race at Nottingham. Three weeks later, he was beaten a neck by the future Prince of Wales's Stakes winner Perpendicular in a Listed race at Goodwood. On his final start of the year he was moved up to Group Three class for the St. Simon Stakes at Newbury. He led in the straight before fading in the final furlong and finishing fourth to Further Flight.

On his 1992 debut, Opera House put up his best performance to date. Although he was beaten in the Gordon Richards Stakes he looked unlucky in running and did well to finish third behind Dear Doctor (Arlington Million) and Red Bishop (Hong Kong Vase). He then recorded his first major win when getting up in the last stride to beat Zoman (Washington, D.C. International) in the Tattersalls Gold Cup at The Curragh. Ten days later he returned to England to win the Group Three Brigadier Gerard Stakes at Sandown.

Opera House lost his next three starts, beginning with a disappointing sixth place in the Prince of Wales's Stakes at Royal Ascot. He was moved up to Group One level and performed with credit, finishing second to Kooyonga in the Eclipse Stakes and third to St Jovite in the King George VI and Queen Elizabeth Stakes.