Phra Nakhon Si Ayutthaya (Thai: พระนครศรีอยุธยา, pronounced [pʰráʔ ná(ʔ).kʰɔ̄ːn sǐː ʔā.jút.tʰā.jāː]) is the capital district (amphoe Mueang) of Phra Nakhon Si Ayutthaya province, central Thailand.

According to George Coedes, tradition states Ramathibodi I founded Dvaravati Sri Ayudhya in 1350.

[2] In 1957 the name was changed to Phra Nakhon Si Ayutthaya.

In addition to the city (thesaban nakhon) of Ayutthaya there are other municipal areas.

Ayothaya is a town (thesaban mueang) which covers part of the tambons Phai Ling, Hantra, and Khlong Suan Phlu.