The 12-metre class was a sailing event on the Sailing at the 1920 Summer Olympics program in Ostend.

In total 18 sailors, on 2 boats, from 1 nation entered in the 12 Metre.

The 1920 Olympic scoring system was used.

During the Sailing regattas at the 1920 Summer Olympics the following persons were competing: "Antwerp 1920".

International Olympic Committee.