Sebastian Stoss (born 14 January 1986 in Cairo, Egypt) is an Austrian swimmer, who specialized in backstroke events.

[1][3] Stoss qualified for the men's 200 m backstroke at the 2008 Summer Olympics in Beijing, by eclipsing a FINA A-standard entry time of 1:59.27 from the European Swimming Championships in Eindhoven, Netherlands.

[4][5] He challenged seven other swimmers on the fourth heat, including three-time Olympians Răzvan Florea of Romania, Simon Dufour of France, and his teammate and two-time Olympic silver medalist Markus Rogan.

He raced to fifth place and nineteenth overall by fifteen hundredths of a second (0.15) ahead of Japan's Takashi Nakano with a time of 1:59.44.

[7] Stoss raced to second place in heat 1 by a single second behind Turkish swimmer and six-time Olympian Derya Büyükuncu with a second-slowest time of 2:02.91.