NCIS

NCIS or N.C.I.S. may refer to:

Law enforcement

National Criminal Intelligence Service, the predecessor to the Serious Organised Crime Agency of the United Kingdom
Naval Criminal Investigative Service, a United States law enforcement and intelligence agency that primarily investigates crimes in the U.S. Navy and Marine Corps
National Criminal Investigation Service (Kripos), a special agency of the Norwegian Police Service

NCIS (franchise)
NCIS (TV series), since 2003, a United States television show about a group of fictional agents of the Naval Criminal Investigative Service based in Washington, DC
NCIS (soundtrack), four soundtracks of music featured on the original NCIS TV series
NCIS: Los Angeles, a 2009 spin-off from NCIS, a show about fictional undercover NCIS Office of Special Projects agents based in Los Angeles
NCIS: New Orleans, a 2014 second spin-off from NCIS, a show about fictional NCIS agents based in New Orleans
NCIS: Hawaiʻi, a 2021 third spin-off from NCIS, a show about fictional NCIS agents based in Hawaii
NCIS: Sydney, a 2023 fourth spin-off from NCIS, a show about fictional NCIS agents and Australian Federal Police based in Sydney, Australia
NCIS: Origins, a 2024 fifth spin-off from NCIS, a prequel show about original protagonist Leroy Jethro Gibbs, a fictional NCIS agent, in his early years