Robert Willis may refer to:

• Robert Willis (physician) (1799–1878), 19th century physician, medical historian and librarian
• Robert Willis (engineer) (1800–1875), 19th century engineer, phoneticist, and architectural historian
• Robert Willis (hacker), hacker and comic books writer

• Robert Watson Willis (1843–1892), 19th century footballer and administrator
• Bob Willis (footballer) (born 1942), Australian rules footballer
• Bob Willis (1949–2019), English cricketer
• Robert Willis (sailor) (born 1987), American Olympic windsurfer

• Robert Willis (diplomat) (1868–1921), English administrator in China
• Robert Willis (minister) (1785–1865), Canadian minister
• Bob Willis (trade unionist) (1904–1982), British trade union leader
• Bobby Willis (1942–1999), British songwriter
• Robert Willis (priest) (1947–2024), Church of England priest and Dean of Canterbury