Sebastian Sailer (12 February 1714 in Weißenhorn – 7 March 1777 in Obermarchtal), born Johann Valentin Sailer, was a German Premonstratensian Baroque preacher and writer.
He is especially known for his comedies written in Swabian German.
Sailer's Swabian dialect is that of his hometown Weißenhorn (in what is now Bavarian Swabia) with influences by the hefty rural dialect of his Upper Swabian parishes.