Petyt may refer to:

• Keith Petyt
• KM Petyt
• William Petyt
• Cyriak Petyt

• TRNA (guanine-N7-)-methyltransferase
• TRNA guanosine-2'-O-methyltransferase
• TRNA-pseudouridine synthase I
• Trnasporter phycosis
• TRNA sulfurtransferase
• TRNA (uracil-5-)-methyltransferase
• Trnava (disambiguation)
• Trnava District
• Trnava Hora
• Trnava, Osijek-Baranja County
• Trnava pri Laborci
• Trnava (Užice)
• Trnavka
• Trnavka (Pardubice District)
• Trnavske myto
• Trnavské automobilové závody
• Trnavské mýto
• Trnavský kraj
• Trnavá Hora
• Trnie
• Trnkov
• Trnopolje camp
• Trnova, Ugljevik
• Trnovec Bartolovečki
• Trnovec nad Váhom