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.

[1] 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.

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