
Ioan Gruffudd (Welsh: [ˈjɔan ˈɡrɪfɪð]; /ˈjoʊɑːn ˈɡrɪfɪθ/; 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 was first 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/Mister Fantastic in Fantastic Four (2005) and its sequel Fantastic Four: Rise of the Silver Surfer (2007), 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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Seven Snipers
2026 · as Milk

Titanic
1997 · as Fifth Officer Lowe

Black Hawk Down
2001 · as LT John Beales

San Andreas
2015 · as Daniel Riddick

Bad Boys: Ride or Die
2024 · as Lockwood

King Arthur
2004 · as Lancelot

Fantastic Four: Rise of the Silver Surfer
2007 · as Reed Richards / Mr. Fantastic

Fantastic Four
2005 · as Reed Richards / Mr. Fantastic

Horrible Bosses
2011 · as Wetwork Man

Playing It Cool
2014 · as Stuffy

Ava
2020 · as Peter

102 Dalmatians
2000 · as Kevin Shepherd

Wilde
1997 · as John Gray

The Secret of Moonacre
2009 · as Sir Benjamin Merryweather / Sir Wrolf Merryweather

Buttons
2018 · as William Kingsley

Sanctum
2011 · as Carl

Mr. Calzaghe
2015 · as Self

Poldark
1996 · as Jeremy Poldark