Cast Robert De Niro as Sam Jean Reno as Vincent Natascha McElhone as Deirdre Stellan Skarsgård as Gregor Sean Bean as Spence Skipp Sudduth as Larry Michael Lonsdale as Jean Pierre Jan Triska as Dapper Gent Jonathan Pryce as Seamus O'Rourke Féodor Atkine as Mikhi Katarina Witt as Natacha Kirilova Bernard Bloch as Sergei Production Screenplay The original screenplay for Ronin was written by J.D.