<P> NCIS : Los Angeles is an American action television series combining elements of the military drama and police procedural genres , which premiered on CBS on September 22 , 2009 , and stars Chris O'Donnell and LL Cool J. The series follows the exploits of the Los Angeles -- based Office of Special Projects ( OSP ) , an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments . NCIS : Los Angeles is the first spin - off of the successful series NCIS . On March 23 , 2017 , CBS renewed the series for a ninth season which premiered on October 1 , 2017 . Nia Long joined the cast as Shay Mosley for the ninth season after Miguel Ferrer 's death . On April 18 , 2018 , CBS renewed the series for a tenth season , which premiered on September 30 , 2018 . </P>
<P> NCIS : Los Angeles is an American action television series combining elements of the military drama and police procedural genres , which premiered on CBS on September 22 , 2009 , and stars Chris O'Donnell and LL Cool J. The series follows the exploits of the Los Angeles -- based Office of Special Projects ( OSP ) , an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments . NCIS : Los Angeles is the first spin - off of the successful series NCIS . On March 23 , 2017 , CBS renewed the series for a ninth season which premiered on October 1 , 2017 . Nia Long joined the cast as Shay Mosley for the ninth season after Miguel Ferrer 's death . On April 18 , 2018 , CBS renewed the series for a tenth season , which premiered on September 30 , 2018 . </P>
when does the new season of ncis los angelos start
when does the new season of ncis los angelos start
September 30 , 2018
September 30 , 2018