Nat or NAT may refer to:

Computing

* Network address translation (NAT), in computer networking

Organizations

* National Actors Theatre, New York City, U.S. * National AIDS trust, a British charity * National Archives of Thailand * National Assembly of Thailand, the national parliament

People and ethnic groups

* Nat (name), a given name or nickname, usually masculine, and also a surname * Nat (Muslim), a Muslim community in North India * Nat caste, a Hindu caste found in northern India and Nepal

Places

* Nat, Punjab, India, a village * Nat, West Virginia, United States, an unincorporated community * Greater Natal International Airport, São Gonçalo do Amarante, Brazil (IATA code NAT) ** Augusto Severo International Airport (closed), former IATA code NAT

Science and technology

Biology and medicine

* Natural antisense transcript, an RNA transcript in a cell * N-acetyltransferase, an enzyme; also NAT1, NAT2, etc. * Nucleic acid test, for genetic material * Neonatal alloimmune thrombocytopenia, a disease * Noradrenaline transporter (NAT), also called norepinephrine transporter (NET) * Nucleobase ascorbate transporter (NAT) family, or Nucleobase cation symporter-2 (NCS2) family

Other uses in science and technology

* Nat (unit), a logarithmic unit of information or entropy * Nottingham Asphalt Tester

Other uses

* Nat (deity), deities worshipped in Myanmar and neighboring countries * Nat (Wild Cards), Nat (''Wild Cards''), the nature of some characters in the ''Wild Card'' novels * Nat Smurfling, a fictional character from ''The Smurfs'' * ''NAT: An Orchestral Portrait of Nat "King" Cole'', a 1966 album by Nelson Riddle * National Achievement Test, in the Philippines * North Atlantic Tracks, a set of flight routes