King City Secondary School, or KCSS, is a secondary education facility in King City, Ontario, Canada. It is a secular public school administered by the York Region District School Board. The school is located at 2001 King Road, and the current principal is Helga Curry. The school day runs from 08:20 to 14:30.

King City is an unincorporated Canadian community in the township of King, Ontario, located 40 kilometres (25 mi) north of Toronto. It is the largest community in King township, with 2,730 dwellings and a population of 8,396 as of the 2021 Canadian census.