Cha-am[1] (Thai: ชะอำ, pronounced [tɕʰáʔām] or [tɕʰāʔām]) is a district (amphoe) in the southern part of Phetchaburi province, western Thailand.

Mrigadayavan Palace (Thai: พระราชนิเวศน์มฤคทายวัน, RTGS: Phra Ratchaniwet Maruekkhathayawan) in Cha-am district is a former residence of King Vajiravudh or Rama VI who ruled Siam from 1910 to 1925.

Its name "Cha-am" is said to have originated from the word "Cha-an" (ชะอาน, pronounced [tɕʰáʔān] or [tɕāʔāːn]) meaning "to wash the saddle".

27 km (17 mi) to the south is Hua Hin district of Prachuap Khiri Khan province, also a beach resort.

The province, however, has dropped from the fourth to the sixth most popular destination in Thailand due to coastal erosion, much of it in Cha-am, caused by rising sea levels leading to "deteriorating scenery".