James Franco as Tristan

Sophia Myles as Isolde

Rufus Sewell as Marke

David O'Hara as Donnchadh

Mark Strong as Wictred

Henry Cavill as Melot

Bronagh Gallagher as Bragnae

Ronan Vibert as Bodkin

Lucy Russell as Edyth

JB Blanc as Leon

Graham Mullins as Morholt

Leo Gregory as Simon

Dexter Fletcher as Orick

Richard Dillane as Aragon

Hans Martin Stier as Kurseval

Thomas Morris as Kaye

Jamie Thomas King as Anwick

Wolfgang Müller as Rothgar

Cheyenne Rushing as Lady Serafine

Barbora Kodetová as Lady Marke

Isobel Moynihan as Young Isolde

Thomas Brodie-Sangster as Young Tristan

Gordon Truefitt as Tournament Judge

Myles Taylor as Young Melot

Jack Montgomery as Young Simon

Marek Vašut as Luther

David Fisher as Irish Soldier

Bronwen Davies as Lady Aragon

Philip O'Sullivan as Paddreggh

Nevan Finegan as Tournament Crier

Jón Ólafsson as Coronation Priest

Todd Kramer as Widseth

Winter Ave Zoli as Widseth's Sister

Miroslav Šimůnek as Pict Guard

Kevin Flood as Funeral Priest