William Merz
| Olympic medal record | ||
|---|---|---|
| Men's gymnastics | ||
Competitor for the  United States
| ||
| Silver | 1904 St Louis | Rings |
| Bronze | 1904 St Louis | Combined |
| Bronze | 1904 St Louis | Vault |
| Bronze | 1904 St Louis | Pommel horse |
| Men's athletics | ||
| Bronze | 1904 St Louis | Triathlon |
William G. Merz (April 25, 1878 – March 17, 1946) was an American gymnast and track and field athlete who competed in the 1904 Summer Olympics.
He died in Overland, Missouri.
In 1904 he won the silver medal in the rings event and a bronze medal in combined event, in vault event, in pommel horse event and in athletics' triathlon. He was fourth in team event, tenth in all-around competition and 24th in gymnastics' triathlon event.