Peter Marshall may refer to:

Entertainment

• Peter Marshall (entertainer) (born 1926), American game show host of The Hollywood Squares, 1966–1981
• Peter Marshall (author, born 1939) (1939–1972), British novelist whose works include The Raging Moon and Excluded from the Cemetery
• Peter Marshall (author) (born 1946), British travel writer whose works include Demanding the Impossible: A History of Anarchism and Europe's Lost Civilization
• Peter Marshall (UK broadcaster) (born 1945), British game show host of Sale of the Century in the 1980s

Sports

• Peter Marshall (cricketer) (born 1963), New Zealand cricketer
• Peter Marshall (footballer, born 1942), Australian footballer for Collingwood in the 1960s
• Peter Marshall (footballer, born 1954), Australian footballer for Collingwood in the 1970s
• Peter Marshall (squash player) (born 1971), English squash player
• Peter Marshall (swimmer) (born 1982), American swimmer

Other

• Peter Marshall (Presbyterian minister) (1902–1949), Scottish-born American Presbyterian pastor, chaplain of the United States Senate
• Peter Marshall (Anglican priest) (1940–2020), Anglican Dean of Worcester
• Peter Marshall (journalist) (born 1952), British journalist and broadcaster BBC Newsnight
• Peter Marshall (police officer) (born c. 1953), commissioner of New Zealand and the Solomon Islands police services
• Peter Marshall (historian) (born 1964), history professor at Warwick University
• Peter Marshall (diplomat) (1924–2023), British ambassador and Commonwealth Deputy Secretary-General (1983–88)
• Peter Paul Marshall (1830–1900), Scottish civil engineer, painter, and partner in Morris, Marshall, Faulkner & Co.
• P. J. Marshall (Peter James Marshall, born 1933), history professor at King's College London