Beginning with the upcoming season Brian Dietzen will be promoted to a series regular having been given a contract with CBS.
Diane Neal, Daniel Luis Rivas, Robert Wagner, and Ralph Waite have confirmed that they will reprise their roles in the upcoming season. Additionally Michael des Barres and Billy Dee Williams will appear in season ten in guest appearances
Greg Germann, has been cast in a potentially recurring role as Jerome Craig, the Deputy Director of NCIS under Leon Vance.
Oded Fehr, has been cast as Ilan Bodner, Deputy Director of Mossad under Eli David.
Brighton Sharbino has been cast as the young Abby Sciuto for an episode airing in the spring.
Jamey Sheridan will appear as Admiral John McGee, the father of Tim McGee as part of a multi episode arc beginning in March.
Michael Weatherly directed an upcoming episode, "Seek" which is scheduled to air on March 19th
Marina Sirtis has been cast as Eli David's successor as Director of Mossad.
Colin Hanks will appear in season finale as an investigator for the Department of Defense
John M. Jackson will reprise his long running role of Vice Admiral A.J. Chegwidden, USN, (Ret), the former Judge Advocate General in season finale. Jackson on originally played the role for seven seasons on NCIS parent series JAG.
Muse Watson will reprise his role of Mike Franks for the season finale.