Serhiy Nazarovych Bubka (Ukrainian: Сергі́й Наза́рович Бу́бка; Russian: Серге́й Наза́рович Бу́бка, Sergey Nazarovich Bubka; born 4 December 1963) is a retired Ukrainian pole vaulter. Repeatedly voted the world's best athlete, he represented the Soviet Union until its dissolution in 1991.

Bubka won 6 consecutive IAAF World Championships, an Olympics gold and broke the world record for men's pole vaulting 35 times (17 outdoor and 18 indoor records). He was the first to clear 6.0 metres and the only (as of February 2012) to clear 6.10 metres (20 ft).

He holds the current outdoor world record of 6.14 metres (20 feet 1³⁄₄ inches), set on 31 July 1994 in Sestriere, Italy and the current indoor world record of 6.15 meters, set on 21 February 1993 in Donetsk, Ukraine.

Born in Voroshilovgrad (Luhans'k now), Ukraine, Bubka was a good track-and-field athlete in the 100-meter dash and the long jump, but he became a world-class competitor only when he turned to the pole vault. In 1983, virtually unknown in international meets, he won the world championship at Helsinki, Finland, and the following year he set his first world record, clearing 5 m 75 cm (19 ft 2‚ in). Until the dissolution of the Union of Soviet Socialist Republics (USSR) in late 1991, Bubka competed for Soviet teams. The Soviet sports system rewarded athletes for setting new world records, and he became noted for establishing new records by slim amounts, sometimes as little as a centimeter higher. This allowed him to collect frequent bonus payments and made Bubka an attraction at track-and-field meets.