Park Street Collegiate Institute (PSCI) is a secondary school located in Orillia, Ontario, Canada. It was built in 1961 to help with the overflow of students from Orillia District Collegiate & Vocational Institute. In March, 2008, a review process will begin to consolidate Orillia's three public high schools into two buildings as a result of cost of maintenance of the aging buildings and the declining enrolment at PSCI.