The (outdoor) men's singles competition at the 1912 Summer Olympics was part of the tennis program for the games.

[2] 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.

The indoor events, held in May, were thus attended by top-flight players, while the outdoor competitions were not.

The tournament was beset by withdrawals; there were 67 entries, necessitating drawing up a bracket for seven rounds, but only 49 men actually started.