Phutthamonthon (Thai: พุทธมณฑล, pronounced [pʰút.tʰā.mōn.tʰōn]) is a district (amphoe) in the east of Nakhon Pathom province, central Thailand.

Neighbouring districts are (from the north clockwise): Bang Len; the districts Sai Noi, Bang Yai and Bang Kruai of Nonthaburi province; the district Thawi Watthana of Bangkok, and Sam Phran and Nakhon Chai Si.

The minor district (king amphoe) was created on 1 April 1991, when three tambon were split off from Nakhon Chai Si district.

[1] It was upgraded to a full district on 5 December 1996.

The district is divided into three subdistricts (tambons), which are further subdivided into 18 villages (mubans).