The 15th Infantry Division (พล.ร.๑๕.) is an infantry division of the Royal Thai Army, it is currently a part of the Fourth Army Area. The unit is composed of the 151st Infantry Regiment, 152nd Infantry Regiment and 153rd Infantry Regiment and Service Support Regiment. The division engaged in the South Thailand insurgency.

The Royal Thai Army or RTA is the army of Thailand and the oldest and largest branch of the Royal Thai Armed Forces.