Rantau Panjang (Kelantanese: Ghata Panjey; Jawi: رنتاو ڤنجڠ; Thai: รันเตาปันจัง) is a mukim (subdistrict/commune) and also a parliamentary constituency in Pasir Mas District, Kelantan, Malaysia, located next to the Thai border.

The town of Su-ngai Kolok is situated adjacent to Rantau Panjang, right across the Golok River. Both towns are linked via the Rantau Panjang-Sungai Golok Bridge, popularly known as the Harmony Bridge (Malay: Jambatan Muhibbah).

Along with Pengkalan Kubor on the South China Sea coast, Rantau Panjang is a popular place for duty-free shopping.

• Google Maps link of Rantau Panjang (to the right of the Golok River) and Su-ngai Kolok town in Thailand to the left of the river.

6°01′21″N 101°58′09″E / 6.02254°N 101.96918°E / 6.02254; 101.96918