Ioan Gruffudd (Welsh: ['j?an 'grIfId]; /'jo??:n 'grIfI?/; born 6 October 1973) is a Welsh-American actor. He is known for his roles in film and television series in the United Kingdom, the United States, and Australia.

He first was noted for his portrayal of Harold Lowe in Titanic (1997) and for his portrayal of Horatio Hornblower in the Hornblower series of television films (1998-2003). Subsequent roles have included Lancelot in King Arthur (2004), Reed Richards/MMister Fantastic in Fantastic Four (2005) and its 2007 sequel, William Wilberforce in Amazing Grace (2006), Tony Blair in W. (2008), and Adam Lockwood in Bad Boys: Ride or Die (2024).

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