Robert, Rob, Bob or Bobby Walker may refer to:
- Robert Walker (actor, born 1888) (1888–1954) American actor
- Robert Walker (actor, born 1918) (1918–1951), actor in Strangers on a Train (1951)
- Robert Walker (actor, born 1940) (1940–2019), actor in Ensign Pulver and Easy Rider
- Robert Walker (animator) (1961–2015), Disney animator who directed Brother Bear
- Robert Walker (painter) (1599–1658), English portrait painter
- Robert Walker (musician) (1937–2017), American blues guitarist
- Robert Walker (composer) (born 1946), English composer and broadcaster
- Robert G. Walker (1917–1988), American television director
- Bob Walker (photographer) (1952–1992), American photographer and environmental activist
- Rob Walker (poet) (born 1953), Australian poet
- Bob Walker (footballer, born 1942), English footballer
- Bob Walker (footballer, born 1891) (1891–1965), Australian footballer for Essendon
- Bob Walker (footballer, born 1912) (1912–1997), Australian footballer for Geelong
- Bobby Walker (Australian footballer) (1900–1971), Australian footballer for Fitzroy
- Bobby Walker (footballer, born 1879) (1879–1930), Scottish international footballer
- Bobby Walker (footballer, born 1906) (1906–?), Scottish footballer in Scotland and the United States
- Bobby Walker (golfer) (1943–1995), Scottish golfer
- Robert Walker (American football) (born 1972), American former college football running back
- Robert Walker (Australian footballer) (born 1970), former Australian rules footballer
- Robert Walker (Newton Heath footballer) (fl. 1898–99), English footballer for Newton Heath
- Robert Walker (footballer, born 1884) (1884–late 1940s), English footballer
- Robert Walker (footballer, born 1903), English footballer for Bradford City
- Robert Walker (footballer, born 1922) (1922–1991), Scottish footballer for Bournemouth and Wrexham
- Robert Walker (footballer, born 1982), Scottish footballer for Hamilton
- Robert Walker (Swedish footballer) (born 1987), Swedish footballer for Örebro
- Robert Walker (Third Lanark footballer), one of the first black Scottish footballers
- Robert Walker (rower) (born 1973), Australian Olympian rower.
- R. T. Walker (Robert Taylor Walker, 1914–?), American baseball player
- Bobby Walker (wrestler), professional wrestler
- Robert Sandilands Frowd Walker (1850–1917), British soldier and colonial officer in Malaya
- Robert Barrie Walker (1878–1961), British trade unionist
- Robert M. Walker (physicist) (1929–2004), American physicist and planetary scientist
- Robert Walker (sailor) (1929–2016), United States Navy
- Robert Walker, Baron Walker of Gestingthorpe (1938-2023), British law lord and Lord of Appeal in Ordinary
- Robert M. Walker (born 1949), United States Under Secretary of the Army, 1997–1998
- Robert Bruce Napoleon Walker, English trader, explorer and collector of zoological specimens
- R. B. J. Walker, Canadian international relations theorist