Wally, Walt, or Walter Miller may refer to:

• Walt Miller, a character in the TV series New Girl
• Walter Miller (actor) (1892–1940), American film actor
• Walter C. Miller (1926–2020), American television director and producer

• Walter Dale Miller (1925–2015), American politician
• Walter L. Miller (politician) (1830–?), New Brunswick-born Wisconsin politician

• Wally Miller (1917–1992), Australian footballer
• Walt Miller (basketball) (1915–2001), American basketball player
• Walt Miller (baseball) (1883–1956), American baseball pitcher
• Walter Miller (American football), American football coach in the United States
• Walter Miller (footballer) (1882–1928), English footballer
• Walter Miller (ice hockey) (1887–1959), Canadian ice hockey player
• Walter Miller (jockey) (1890–1959), American Hall of Fame jockey
• Walter Miller (rugby league), rugby league footballer of the 1910s for New Zealand, and Wellington
• Walter Miller (wrestler), Australian middleweight wrestling champion
• Jake Miller (pitcher) (Walter Miller, 1898–1975), American baseball pitcher

• Walter Miller (philologist) (1864–1949), American classical linguistics scholar
• Walter B. Miller (1920–2004), American anthropologist
• Walter James Miller (1918–2010), American literary critic, playwright, poet, and translator
• Walter L. Miller (endocrinologist), American endocrinologist and professor of pediatrics
• Walter Lee Miller Jr., United States Marine Corps officer
• Walter M. Miller Jr. (1923–1996), American science fiction author

• Walter Millar, unionist politician in Northern Ireland