Hartmann "Harti" Weirather (born January 25, 1958) is a former World Cup alpine ski racer from Austria. Born in Reutte, Tyrol, he specialized in the downhill event.
During the early 1980s, Weirather won six World Cup downhill races and won the downhill at the 1982 World Championships in Schladming, Austria. In addition, he won the World Cup season title in downhill in 1981.
Harti Weirather is married to the former World Cup ski racer Hanni Wenzel of Liechtenstein. The pair run a business consultancy firm in Planken, Liechtenstein. Their daughter, Tina Weirather, is a world junior champion and currently competes in the World Cup for Liechentenstein.