TAPI is a four-letter abbreviation, and may refer to:
- Telephony Application Programming Interface, an API which enables PCs running Microsoft Windows to use telephone services
- Turkmenistan-Afghanistan–Pakistan–India pipeline (Trans-Afghanistan Pipeline), a proposed natural gas pipeline
- Teva Active Pharmaceutical Ingredients, a stand-alone business unit of Teva Pharmaceutical Industries limited
Tapi may refer to:
- Dragan Malesevic Tapi (Dragan Malešević Tapi), Serbian hyperrealist painter. Tapi is actually the nickname.
- Tapti River (often spelled Tapi), in the state of Gujarat, India, entering the sea at Surat
- Tapi River, Thailand (Thai: ตาปี, sometimes spelled Tapee), in the Surat Thani Province, Southern Thailand
- Tapi, Albania
- Tapi, Pakistan, a village in the North Waziristan province and the site of two drone attacks by the United States military
- TAPI-0 and TAPI-1, inhibitors used in biochemistry
Tapi is one of the Indian surnames:
- Tapi Dharma Rao, Indian writer.
- Tapi Chanakya, Indian film director.