|This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name.|
NCIS may refer to:
- The NCIS series itself.
- Naval Criminal Investigative Service, the armed federal agency that constitutes the backbone of the series.
- "National Crop Insurance Service", an international organization mentioned in the Season One finale episode Reveille and at later times hinted about (e.g., "Meat inspectors").