NCIS

• Naval Criminal Investigative Service, a United States law enforcement agency that investigates crimes in the U.S. Navy and Marine Corps
• NCIS , a United States television show about a group of fictional agents of the above agency
• NCIS , three soundtracks of music featured on the original NCIS series
• Los Angeles, a spin-off of the show above, a show about fictional undercover NCIS agents in Los Angeles

• National Criminal Intelligence Service, the predecessor to the Serious Organised Crime Agency of the United Kingdom
• New Century Infusion Solutions, Inc., a health care management organization that specializes in cancer care

See also

• National Crime Information Center (NCIC)