Is Stephen Amell related to Chris O'Donnell?

No, Stephen Amell and Chris O'Donnell are not related. They are both actors known for their roles in popular television series, with Amell best known for playing Oliver Queen in "Arrow" and O'Donnell for his role as Robin in the "Batman" franchise and on the series "NCIS: Los Angeles." However, they do not share a familial connection.