Santi Suk () is a tambon (subdistrict) of Doi Lo District, in Chiang Mai Province, Thailand. In 2015 it had a population of 3,852 people.
The subdistrict was created effective 1 May 1991 by splitting off eight administrative villages from Yang Khram.
The tambon is divided into nine administrative villages (mubans).
The subdistrict is covered by the subdistrict municipality (thesaban tambon) Santi Suk (à ¹Âà ¸Âà ¸¨à ¸Âà ¸²à ¸¥à ¸Âà ¸³à ¸Âà ¸¥à ¸ªà ¸±à ¸Âà ¸Âà ¸´à ¸ªà ¸¸à ¸Â).