Cote de Pablo who portrayed Ziva decided not to renew her contract for Season 11 citing a lack of financial parity under the contract offered by the studio and producers. Her final appearance as a series regular has occurred in the second episode of the season, Past, Present and Future (episode). As stated by Executive Producer Gary Glasberg, Ziva's departure from the series did not involve her death.
Marina Sirtis has briefly reprised her role as Director of Mossad Orli Elbaz.
A new character named Murray, the I.T. department's new hire, who is a towering figure tasked with digging up information on an intruder and tracking down a potential hacker, was introduced in the first episode. He was played by Will (William A. Paxton) Harris.
Margo Harshman is portraying McGee's girlfriend Delilah.
Roma Maffia is portraying an NIS/NCIS Agent nearing retirement who had a history with Gibbs and Mike Franks.
Muse Watson has reprised his role as Mike Franks.
The process of casting Cote de Pablo's replacement has begun, the role was filled earlier than expected, and the first episode with her, Gut Check, has aired in November.
The new agent is named Eleanor Bishop and was described in the casting notice as follows: Agent Bishop — 20 something bright, educated, athletic, attractive, fresh-faced, focused and somewhat socially awkward. She has a mysterious mixture of analytic brilliance, fierce determination and idealism. She’s traveled extensively, but only feels comfortable at home.
Emily Wickersham has been cast in the role of Agent Bishop. Wickersham's role was initially a three episode agreement with a series regular option. She has officially been promoted to a series regular on NCIS in 2014.
Melinda McGraw has reprised her role of Diane Sterling for the 10th episode of Season 11 aired on 10 December 2013.