Trang, also called Mueang Thap Thiang, is one of the southern provinces (changwat) of Thailand, on the west side of the Malay Peninsula facing the Strait of Malacca. Neighboring provinces are (from north clockwise) Krabi, Nakhon Si Thammarat, Phatthalung, and Satun.

Trang was formerly a port involved in foreign trade. It was the first place where rubber was planted in Thailand. Phraya Ratsadanupradit Mahison Phakdi brought rubber saplings from Malaya and planted them here in 1899, and rubber is now an important export of the country. The Trang River flows through the province from its origin in the Khao Luang mountain range, and the Palian River flows from the Banthat mountains. The province of Trang has an area of approximately 5,000 square km and 199 km of Strait of Malacca shoreline.