Sebastian Bayer (born 11 June 1986 in Aachen, West Germany) is a German long jumper best known for having history's second longest indoor long jump.

He also competed at the 2006 European Championships and the 2008 Olympic Games without reaching the final.

On 8 March 2009 at the European Indoor Track and Field Championships in Torino, Italy, Bayer long jumped 8.71 m (28 ft 7 in) to win the gold medal.

This is the second longest indoor long jump in history, behind Carl Lewis’ 8.79 m (28 ft 10 in) world indoor record set on 27 January 1984 at the Millrose Games in New York City, NY.

Bayer's jump also bested the European indoor record, formerly held by Yago Lamela from Spain, by 15 centimetres (6 in).