Nag or NAG may refer to:
Computers Nag, a multi user tasklist manager included in Horde (software) Numerical Algorithms Group, a software company NAG Numerical Library, numerical analysis software Numeric Annotation Glyphs, in computerized chess
Music "Nag", a song on Joan Jett's album I Love Rock 'n' Roll Stage name of Jan-Erik Romøren of Norwegian band Tsjuder
Organizations National Academy of Governance, the civil servant academy operated by the Chinese central government Neighbourhood action group, community volunteer groups in the United Kingdom Neue Automobil Gesellschaft, a defunct German automobile manufacturer Nordic Aviation Group, an Estonian airline company
People Martin Nag, Norwegian writer
Places Nag, Iran, a village in Kerman Province Nag Hammadi, in Upper Egypt Nag River, in India Nag Tibba, a mountain in Uttarakhand, India
Religion Nag Dhunga, a sacred stone worshiped by the people of Nepal Nag Hammadi library, a collection of Gnostic texts discovered in Egypt in 1945 Nag Hammadi Codex II, a collection of early Christian Gnostic texts Nag Hammadi Codex XIII, a collection of early Christian Gnostic texts Nag Panchami, Hindu snake worship Nag Shankar, a temple in the Sonitpur district, India
Other Nag, a cobra in Rudyard Kipling's Rikki-Tikki-Tavi Nāg, refers to the Indian cobra Nag (missile), a third generation "fire and forget" anti-tank missile Nag Champa, an Indian fragrance Nag Hammadi massacre, a massacre of Coptic Christians in Egypt in 2010 Nag Nag Nag, a former nightclub in London Nag Nathaiya (festival), in Varanasi, India Nag Vidarbha Andolan Samiti, a separatist political organization in Maharashtra, India Dr. Babasaheb Ambedkar International Airport (IATA code), Nagpur, India N-Acetylglucosamine, a biological molecule
See also Naga (disambiguation) Nāga, a deity in the form of a serpent in Hinduism and Buddhism Ichchadhari Naags, shape-shifting Nāgas in Indian folklore Nagi (disambiguation) Nago, a city at the Okinawa Island in Japan Nagu, a former municipality in Finland Nag's Head (disambiguation) Nagging