NECA
- 5′-(N-Ethylcarboxamido)adenosine
- Adenosine A2A receptor
- NECA Project
- NECA Show
- National Electrical Contractors Association
- National Entertainment Collectibles Association
- National Exchange Carrier Association
- Neca (footballer)
- Nitrous Oxide Emission Control Area
- North East Combined Authority
- North East Combined Authority (2014–2024)