William Muller
William Müller or William Mueller is the name of the following people:
- William Müller (singer) (1845–1905), German opera singer (tenor)
- William Müller (architect) (1871–1913), German architect
- William Mueller (* 1980), American wrestler
- William A. Mueller (1901–1992), American sound engineer
- William James Müller (1812-1845), British painter