Ratchaburi (Thai: ราชบุรี) is one of the central provinces in Thailand. Neighboring provinces are (from north clockwise) Kanchanaburi, Nakhon Pathom, Samut Sakhon, Samut Songkhram and Phetchaburi. In the west it borders Tanintharyi Division of Myanmar.

Ratchaburi means, "The land of the king." The province is full of cultural heritage, beautiful places, and historical sites. Ratchaburi covers 5200 square kilometers. It is located 80 kilometers west of Bangkok and borders Burma to the west with the Tanaosi range as a borderline. It has Mea Klong River through the center of town.