- the airline TAP Portugal , formerly TAP Air Portugal (International Civil Aviation Organization code)
- Test Access Port or Network Tap , in computer and communications equipment
- Trans-Afghanistan Pipeline
- Tajna Armia Polska , was a resistance movement in Poland, during the Second World War
- Tuition Assistance Program , a financial aid program in New York State
- Trans-Alaska Pipeline System
- Tandem Affinity Purification, in Proteomics
- Tomographic Atom Probe , an instrument or technique in which a sharp tip is ionized and a 3D atomic reconstruction is made.
- The Amazing Pudding , a magazine about Pink Floyd
- TUN/TAP , a virtual Ethernet device driver
- Telocator Alphanumeric Input Protocol aka IXO
- Test Anything Protocol , a standard output format for the display of software unit testing results
- The Alpiri Project a Semantic Web application
- Transferred Account Procedure the mechanism by which mobile telecom operators exchange roaming billing information
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