The men's 100 metre backstroke was a swimming event held as part of the swimming at the 1924 Summer Olympics programme.

[1] It was the fourth appearance of the event, which was established in 1908.

In the first heat Warren Kealoha set a new Olympic record with 1:13.4 minutes.

In the final he bettered his own record to 1:13.2 minutes.

Wednesday July 16, 1924: The fastest two in each heat and the fastest third-placed from across the heats advanced.