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

Tapi may refer to:

• 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
• Trans-Afghanistan Pipeline

Tapi is one of the Indian surnames:

• Tapi Dharma Rao, Indian writer.
• Tapi Chanakya, Indian film director.

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