The Khlong Tron (Thai: คลองตรอน, pronounced [kʰlɔ̄ːŋ trɔ̄ːn]) is a watercourse of Thailand and part of the Chao Phraya River basin. It joins the Nan River in Uttaradit Province.

17°26′N 100°08′E / 17.433°N 100.133°E / 17.433; 100.133