Nathan O'Toole (born 17 March 1998) is an Irish actor.
He is known for his role as a young Bjorn Ironside in the first, second and third seasons of the History series Vikings.
O'Toole made his television debut at 13 in the Showtime series The Borgias as Vincenzo.
He attended St. Seachnall National School and then Dunshaughlin Community College.
[3] He began taking acting classes with Ann Kavanagh's Young People's Theatre when he was 10.