Phachi (Thai: ภาชี, pronounced [pʰāːt͡ɕʰīː]) is a district in the eastern part of Ayutthaya province.

Phachi in Thai means 'divide' or 'junction', which refers to the railway junction between the northern and northeastern branches in the district.

Neighboring districts are (from the north clockwise) Tha Ruea of Ayutthaya Province; Nong Saeng and Nong Khae of Saraburi province; and Uthai and Nakhon Luang of Ayutthaya.

The district is divided into eight sub-districts (tambon).

This Ayutthaya Province location article is a stub.