Mark Hadlow (born 1957) is a New Zealand actor and comedian.
Hadlow is perhaps best known internationally for the role of Harry in King Kong. He has been cast as Dori in Peter Jackson's The Hobbit movie trilogy. Hadlow's early film appearances were in serious roles, such as in Beyond Reasonable Doubt, but he is perhaps better known in New Zealand for his comedy roles, particularly the sitcom Willy Nilly, and some of the voices for the 1989 Peter Jackson puppet film, Meet the Feebles. He also starred alongside New Zealand Maori comedian, Billy James in The Billy T James Show.
Hadlow has also released an audio CD called "Tall Tales". It consists of classic children's stories narrated and performed with a Kiwi twist.
Between films and television, Hadlow works in Christchurch's Court Theatre, where he has directed, produced, and acted in many plays. Hadlow is known for interacting with the audience whenever possible. This is made easy in the theatre's intimate, 200-seat setting, where the audience is literally next to the stage.
While appearing in a one-man play, he met his ex-wife. They met in the audience before the start of the play because Hadlow always started off in the audience. In his wife's words, "this nice man who I didn't recognise sat next to me and we started chatting. Within minutes he knew a lot about me. Suddenly he got up and started acting in the play."