Kui Buri (Thai: กุยบุรี, pronounced [kūj būrīː]) is a district (amphoe) in the northern part of Prachuap Khiri Khan province, central Thailand.

In the Rattanakosin era, King Rama II established a Mueang Bang Nang Rom, which had its city hall in Kui Buri.

King Mongkut (Rama IV) renamed Mueang Bang Nang Rom "Prachuap Khiri Khan", with the same city hall.

In 1898 the city hall was moved to Ko Lak bay and Kui Buri was downgraded to a subdistrict of Mueang Prachuap Khiri Khan District.

The British diplomat John Crawfurd visited the area in 1822 during the mission described in his book Journal of an embassy from the Governor-General of India to the courts of Siam and Cochin-China: exhibiting a view of the actual state of those kingdoms.