Kien Svay () is a district (srok) of Kandal Province, Cambodia. The district is subdivided into 12 communes (khum): Banteay Daek, Chheu Teal, Dei Edth, Kampong Svay, Kbal Kaoh, Kokir, Kokir Thum, Phum Thum, Preaek Aeng, Preaek Thmei, Samraong Thum, Veal Sbov, and 46 villages (phum).
There is a small resort of shacks on stilts above a river near the town. This is a popular weekend jaunt for Phnom Penh residents.
Kien Svay District lies on road number 1. It is connected between Phnom Penh Capital and Svay Rieng Province. Most people here are farmers.