The (outdoor) men's singles competition at the 1912 Summer Olympics was part of the tennis program for the games. There were 49 competitors from 12 nations. Nations were limited to 8 players each. The event was won by Charles Winslow in an all-South African final over Harold Kitson; they were the nation's first medals in the men's singles. Oscar Kreuzer of Germany won the bronze-medal match against Bohemian Ladislav Žemla.

Austria competed at the 1912 Summer Olympics in Stockholm, Sweden. Austrian and Hungarian results at early Olympic Games are generally kept separate despite the union of the two nations as Austria-Hungary at the time. 85 competitors, 76 men and 6 women, took part in 46 events in 12 sports.