The tenth season of NCIS: Los Angeles an American police procedural drama television series, originally aired on CBS from September 30, 2018, through May 19, 2019. The season was produced by CBS Television Studios, with R. Scott Gemmill as showrunner and executive producer. The season featured the return of David James Elliot and Catherine Bell as Harmon Rabb and Sarah MacKenzie from JAG; it also revealed the outcome of the JAG series finale in 2005. This was also the last season to feature Nia Long as Shay Mosley.