Mark Arnold may refer to:

• Mark Arnold (actor) (born 1957), American actor
• Mark Arnold (volleyball) (born 1964), American volleyball player
• Mark Arnold (musician) (born 1966), American punk rock singer
• Mark Arnold (historian) (born 1966), American writer and commentator

• Mark Arnold-Forster (1920–1981), writer and journalist
• Marc Arnold (born 1970), South African footballer