Ioan Gruffudd (Pronounced Ian Griffin) (born 6 October 1973) is a Welsh actor.
Having trained at the Royal Academy of Dramatic Art, he started off in Welsh language film productions, then came to international attention as Fifth Officer Harold Lowe in the film Titanic (1997), and as Lt John Beales in Black Hawk Down (2001). He is also known in the UK for playing the title role in Horatio Hornblower (1998–2003).
In June 2012, he filmed Mariah Mundi and the Midas Box throughout the south-west of England, playing the role of "Charles Mundi"; the film was released in 2014. Other film roles include Lancelot in King Arthur (2004), Mister Fantastic (Reed Richards) inFantastic Four (2005) and the sequel Fantastic Four: Rise of the Silver Surfer (2007), and British anti-slavery abolitionist William Wilberforce in Amazing Grace (2006). He played Tony Blair in W. (2008). On television he played Andrew Martin in Ringer. Starting in 2014, he plays Dr. Henry Morgan in Forever.