G. Callen — NCIS: Los Angeles Character Profile

About G. Callen

Former foster child turned legendary undercover agent for OSP. Central figure alongside Sam Hanna. Marries long-time love Anna Kolcheck in the series finale and leads a side project mission to rescue Hetty with Nate and Nell.

G. Callen — Character Profile

Affiliations

• NCIS universe

Quick Facts about G. Callen

Occupation

special agent

First Appearance

Identity

Character Facts

Played by

Chris O'Donnell

Appears in

NCIS: Los Angeles (2009)

Role

Protagonist

Relationships (5)

• G. Callen — Chosen Family — Sam Hanna (LL Cool J)

  Partnership transcends professional boundaries to become a chosen family sharing deep personal histories.

• G. Callen — Allies — Marty Deeks (Eric Christian Olsen)

  Grew from a skeptical LAPD liaison to a fully integrated OSP agent with Callen's operational trust.

• G. Callen — Friends — Kensi Blye (Daniela Ruah)

  Reliable friendship built on mutual respect and post-mission debriefing.

• G. Callen — Supervisor/Subordinate — Eric Beale (Barrett Foa)

  Callen provides strategic oversight and mentorship as Eric transitions from tech support to field specialist.

• G. Callen — Friends — Hollace Kilbride (Gerald McRaney)

  Friendship grounded in shared military backgrounds and mutual respect for personal struggles.

Explore the full interactive character relationship map of NCIS: Los Angeles

More characters from NCIS: Los Angeles

• Nate Getz (Peter Cambor)
• Kensi Blye (Daniela Ruah)
• Marty Deeks (Eric Christian Olsen)
• Eric Beale (Barrett Foa)
• Henrietta "Hetty" Lange (Linda Hunt)
• Dominic Vail (Adam Jamal Craig)
• Nell Jones (Renée Felice Smith)
• Fatima Namazi (Medalion Rahimi)
• Devin Rountree (Caleb Castille)
• Shay Mosley (Nia Long)
• Hollace Kilbride (Gerald McRaney)
• Sam Hanna (LL Cool J)