PAT may refer to:
- Port Authority Transit, the light rail system in Pittsburgh, Pennsylvania
- Port address translation
- performance acceleration technology
- Periodistas Asociados de Televisión is a Bolivian television channel
- Portable Appliance Test
- PAT A.I., in Artificial Intelligence
- Progressive Achievement Test, in New Zealand
- Provincial Achievement Test, in Canada
- Point after touchdown, in American Football
- Picture arrangement test
- Poly (A) Test, in Genetic Analysis