In The Godfather, what is the name of Don Corleone’s consigliere?

In The Godfather, Don Corleone’s consigliere is Tom Hagen.

Tom Hagen is the Corleone family’s lawyer and trusted adviser. He is not Vito Corleone’s biological son, but Vito raised him after Sonny found him as an orphaned child. Hagen’s legal training and calm manner make him especially valuable in negotiations and family affairs.

Robert Duvall plays Hagen in The Godfather and its sequel. Within the story, Hagen often serves as the practical, diplomatic counterweight to the more forceful Sonny and the increasingly ruthless Michael. His role includes arranging meetings, communicating with business associates, and helping protect the family’s interests.

The title consigliere means counselor or adviser. It does not mean that Hagen is the family’s boss; Vito is the Don, while Hagen advises him. Another common confusion is identifying Hagen as Vito’s biological son. He is instead an adopted member of the household, which is an important part of his backstory.