Fritz Luchsinger (March 8, 1921 - 28 April 1983) was a Swiss mountaineer. Together with Ernst Reiss he made the first ascent of Lhotse (8,516 m), the fourth highest mountain in the world, on 18 May 1956. During the approach march Luchsinger came down with severe appendicitis, and had to recuperate in a room given to the Swiss expedition by the lama of Tengboche monastery.