Phak Hai (, ) is a district (amphoe) in the northwestern part of Ayutthaya province, central Thailand.
History Historically, the district was named Khwaeng Sena Yai, which became converted to an amphoe at the end of the 19th century. In 1917, the name of district was changed to be Phak Hai after the central tambon.
The name Phak Hai comes from the Nirat Suphan by Sunthorn Phu, which refers to a village named Ban Pak Hai. The spelling has changed however now, so it can also mean a kind of plant (Momordica charantia) that grows in swamps.
Geography Neighboring districts are (from the north clockwise) Wiset Chai Chan and Pa Mok of Ang Thong province; Bang Ban, Sena, and Bang Sai of Ayutthaya Province; and Bang Pla Ma, and Mueang Suphanburi of Suphanburi province.
Administration The district is divided into 16 sub-districts (tambon), which are further subdivided into 128 villages (muban). 1.Phak Haiผักไห่2.Ammaritอมฤต3.Ban Khaeบ้านแค4.Lat Nam Khemลาดน้ำเค็ม5.Talanตาลาน6.Tha Din Daengท่าดินแดง7.Don Lanดอนลาน8.Na Khuนาคู9.Kudiกุฎี10.Lam Takhianลำตะเคียน11.Khok Changโคกช้าง12.Chakkaratจักราช13.Nong Nam Yaiหนองน้ำใหญ่14.Lat Chitลาดชิด15.Na Khokหน้าโคก16.Ban Yaiบ้านใหญ่
In media Phak Hai is the setting of a Thai country song, (luk thung), titled (; ) 'Phak Hai Girl'). It has been popular since around 1970s.
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