Stefan Horngacher (born September 20, 1969 in Wörgl) is a former Austrian ski jumper who competed from 1988 to 2002. He won a bronze medal in the team large hill in the Winter Olympics in both 1994 and 1998. Horngacher also competed at the 2002 Winter Olympics of Salt Lake City, but his best finish was fourth in the team large hill.
Horngacher also won the team large hill at the 1991 FIS Nordic World Ski Championships and followed that with three bronzes over the next ten years (1993, 1999, 2001). He also won a gold at the 2001 FIS Nordic World Ski Championships in he team normal hill event.
After retiring he became a ski jumping coach.