Charoen Rat (Thai: เจริญราษฎร์, pronounced [t͡ɕā.rɤ̄ːn râːt]) is a tambon (subdistrict) of Mae Chai District, in Phayao Province, Thailand. In 2020 it had a total population of 3,807 people. The subdistrict is in the northwestern part of the province not far from the border with Chiang Rai Province. It lies along the National Road 1 (Phahon Yothin Road) and is connected by road to Pa Faek in the north and Mae Chai and Phayao in the south.