Nat or NAT may refer to:
Computing
Network address translation (NAT), in computer networking
Arts and entertainment
Nat Smurfling, a fictional character from The Smurfs
Nat, protagonist of the video game Is This Seat Taken?
NAT: An Orchestral Portrait of Nat "King" Cole, a 1966 album by Nelson Riddle
Chemistry, biology, and medicine
Natural antisense transcript, an RNA transcript in a cell
N-Acetyltransferase, an enzyme; also NAT1, NAT2, etc.
N-Amyltryptamine, a tryptamine derivative
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
Sodium ammonium tartrate tetrahydrate, the material crystallized by Pasteur as enantiomers
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
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
Other uses
Nat (deity), deities worshipped in Myanmar and neighboring countries
Nat (unit), a logarithmic unit of information or entropy
Bestune NAT, a Chinese electric minivan
Nottingham Asphalt Tester
National Achievement Test, in the Philippines
North Atlantic Tracks, a set of flight routes
North Atlantic Treaty, the treaty that implemented NATO
NAT, IATA airport code for Greater Natal International Airport, São Gonçalo do Amarante, Brazil
NAT, former IATA airport code for Augusto Severo International Airport (closed)