NCIS: Los Angeles season 9

The ninth season of NCIS: Los Angeles premiered on October 1, 2017 on CBS for the 2017–18 television season, and concluded on May 20, 2018. The season contained 24 episodes and the series’ 200th episode. Nia Long joined the cast as Shay Mosley for the ninth season  after Miguel Ferrer's death.

The ninth season ranked 23 with a total of 10.50 million viewers.

Main

 * Chris O'Donnell as Grisha "G." Callen, NCIS Special Agent in Charge (SAC)
 * Daniela Ruah as Kensi Blye, NCIS Junior Special Agent
 * Eric Christian Olsen as Marty Deeks, L.A.P.D. Detective And Liaison To NCIS
 * Barrett Foa as Eric Beale, NCIS Technical Operator
 * Renée Felice Smith as Nell Jones, NCIS Special Agent and Intelligence Analyst
 * Nia Long as Shay Mosley, NCIS Executive Assistant Director for Pacific Operations (EADPAC)
 * Linda Hunt as Henrietta Lange, NCIS Supervisory Special Agent (SSA) and Operations Manager
 * LL Cool J as Sam Hanna, NCIS Senior Special Agent, second in command

Recurring

 * Vyto Ruginis as Arkady Kolcheck
 * Bar Paly as Anastasia "Anna" Kolcheck, an ATF Agent and Callen's girlfriend.
 * John M. Jackson as Rear Admiral A. J. Chegwidden, JAGC, USN (Ret.)
 * Andrea Bordeaux as Harley Hidoko, NCIS Special Agent and Executive Assistant to the EADPAC.
 * Jeff Kober as Harris Keane
 * Pamela Reed as Roberta Deeks, Deeks' mother.
 * Daniel J. Travanti as Nikita Aleksandr Reznikov / Garrison, Callen's father
 * Ravil Isyanov as Anatoli Kirkin
 * Patrick St. Esprit as LAPD Lieutenant Roger Bates
 * Karina Logue as LAPD Detective Ellen Whiting
 * Max Martini as Arlo Turk
 * Bobby Lee as Rio Syamsundin
 * Drew Waters as Brian Bush, FBI Agent
 * Malese Jow as Jennifer Kim
 * David Paul Olsen as Tom Olsen, Sam’s former SEAL buddy