Tartar may refer to:
Coordinates: 40°20′42″N 46°55′44″E / 40.34500°N 46.92889°E
Tərtər (also, Mir Bashir, Mirbäshir, and Terter) is a city in and the capital of the Tartar Rayon of Azerbaijan.
Tartar (later named Toy, foaled 1789) was a British Thoroughbred racehorse best known for winning the classic St Leger Stakes in 1792. One of the smallest horses to win a classic, he won the St Leger on his racecourse debut in September 1792. He won twice in the following season before racing without success in 1794.
Tartar was a chestnut horse standing 14.1 hands high, foaled in 1789. He was sired by Florizel a successful racehorse whose other offspring included the Epsom Derby winners Diomed and Eager as well as the St Leger winner Ninety-three. Tartar was the sixth of eight foals produced by the Duke of Cumberland's mare Ruth.
The name Tartar had previously been used for several other horses in the 18th century. The most notable was a Yorkshire-bred racehorse who sired Herod and was therefore the paternal great-grandsire of the St Leger winner who shared his name.
Until 1913, there was no requirement for British racehorses to have official names, and the horse who later became known as Tartar competed in 1792 as Ld A. Hamilton's ch. c. by Florizel out of Ruth.