Mark Flanagan may refer to:

• Mark Flanagan (actor), Welsh television actor
• Mark Flanagan (boxer) (born 1990), Australian boxer
• Mark Flanagan (chef), head chef to the royal household of the UK
• Mark Flanagan (communications), former head of strategic communications at 10 Downing Street, now a partner at Portland Communications
• Mark Flanagan (musician), British blues guitarist
• Mark Flanagan (rugby league) (born 1987), English rugby league player
• Mark Flanagan (rugby union) (born 1989), Irish rugby union player
• Mark Flanagan, owner of the Largo nightclub in Los Angeles
• Mark G. Flanagan (born 1963), American politician

• Marc Flanagan (born 1948), American television producer and writer