Sebastian Gessl (born 30 June 1996) is an Austrian footballer.
In 2006, Gessl joined the youth academy of Rapid Wien, Austria's most successful club.
In 2014, he signed for Karlsruher SC II in the German fifth division.
In 2018, he trialed with Scottish side Aberdeen.
In 2019, Gessl signed for Horn in the Austrian second division from the reserves of German Bundesliga team 1899 Hoffenheim.