The men's single sculls competition at the 1948 Summer Olympics took place at Henley-on-Thames, London, United Kingdom. The event was held from 5 to 9 August. There were 14 competitors from 14 nations, with each nation limited to a single boat in the event. The event was won by Mervyn Wood of Australia, the nation's third victory in four Games (Bobby Pearce had won in 1928 and 1932). Eduardo Risso's silver was Uruguay's second medal in the event, after a bronze in 1932. Italy received its first men's single sculls medal with Romolo Catasta's bronze. The United States had its five-Games podium streak in the event ended, as John B. Kelly Jr. lost his semifinal by 0.4 seconds and did not advance to the final.