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

Television

 * 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

Other uses

 * National Coalition of Independent Scholars
 * NATO Common Interoperability Standards
 * Nothing's Carved in Stone, a Japanese rock band formed in 2009