• NEG Micon, now part of Vestas
• Net energy gain
• Noah Eli Gordon, an American poet
• Non-Evaporable Getter, a material used in high vacuum technology
• National Express Group, a UK-based transport group
• Negative, a common military command. Also used on instant message clients, e.g. AIM, Windows Live Messenger.
• the IATA code for Negril Aerodrome in Jamaica
• Neg (seduction), a seemingly accidental insult with the intent of actively demonstrating a lack of interest.

It may also refer to someone with the name Neg:

• Neg Dupree, of Neg's Urban Sports