Phu Chi Fa (Thai: ภูชี้ฟ้า), also Phu Chee Fah, is a mountain in Thailand located at the eastern edge of Thoeng District, Chiang Rai Province.
The mountain is part of an elevated area, the Doi Pha Mon subrange, that rises near the border with Laos sloping towards the Mekong River. With spectacular views over the surrounding mountains, it is one of the famous tourist attractions of the Thai highlands near Chiang Rai town. Tourists visit the mountain especially at dawn in order to catch a glimpse of the "sea of mist", the view of the fog-surrounded hills, with heights ranging between 1,200 and 1,600 m to the east of the mountain.