PTT

'PTT' may refer to:

★ PTT Public Company Limited, a Thai oil and gas company

★ Partial thromboplastin time, a performance indicator in medicine

★ Pennsylvania Tunnel and Terminal Railroad, the owner of the tunnels to New York Penn Station

★ Petronas Twin Towers in Kuala Lumpur, Malaysia

★ Police Tactical Team, now Singapore Police Force's Special Tactics and Rescue unit

★ Postal Telephone and Telegraph, a government agency in many countries worldwide

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★ also Post Telefon Telegraph

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★ also Public Telegraph and Telephone

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★ also Poste, Téléphone et Télécommunications

★ Post Tetanic Potentiation, a neurological phenomenon

★ Prince's Trust Team, a development programme for teenagers by partners of the Prince's Trust throughout the UK

★ Professional Technology Temple (Ptt), the largest Bulletin board system in Taiwan

★ Protein truncation test

★ Photothermal Therapy (PTT), A method of using light and photosensitizers for medical treatments.

★ Push to talk, also "Press-to-Transmit", a method of conversing on half-duplex communication lines