National Executive Committee (NEC) is the name of a leadership body in several organizations, mostly political parties:
- National Executive Committee of the African National Congress, in South Africa
- Australian Labor Party National Executive
- National Executive of the Bharatiya Janata Party, in India
- National Executive Committee of the Labour Party, in the United Kingdom
- National Executive Committee for Space-Based Positioning, Navigation and Timing (PNT), a United States Government organisation