Walter Müller or Mueller may refer to:
Sports Walter Mueller (1894–1971), American baseball player Walter Müller (biathlete) (1940–1966), Austrian Olympic biathlete Walter Müller (footballer, born 1938) (1938–2018), Swiss footballer Walter Müller (footballer, born 1970) (born 1970), Swiss footballer Walter Müller (footballer, born 1920) (1920–2010), Swiss footballer Walter Müller (footballer, born 1910) (1910–?), Swiss footballer Walter Müller (German gymnast) (1930–2021), German Olympic gymnast Walter Müller (Swiss gymnast) (born 1940), Swiss Olympic gymnast Walter Müller (handballer) (born 1957), Swiss handballer
Arts and entertainment Walter Müller (actor) (1911–1969), Austrian film actor Walter Andreas Müller (born 1945), Swiss stage and film actor Walter Müller (writer), Austrian writer, winner of an award at the 1979 Festival of German-Language Literature
Other Walter H. Mueller (?–2011), American politician Walter Müller (Panzerjäger) (1914–2003), German army officer Walter W. Müller (1933–2024), German specialist in ancient South Arabia and Semitic epigraphy
See also Walter Möller (1920–1971), German politician