Orillia Secondary School

Orillia Secondary School (OSS) is a secondary school located in Orillia, Ontario. It was established in 2015, and has a population of about 1,200 students. The school building was built between 2014 and 2016, and is equipped with a triple gymnasium, technology rooms, a library, and cafeteria. The principal is Brae Montgomery.

Origins
After the 2012–2013 academic year, Orillia District Collegiate & Vocational Institute was merged with Park Street Collegiate Institute, which after declining enrollment, was demolished so that a new school could be built on its former site, at the intersection of Park Street and Collegiate Drive.

Progress Pride flag controversy
In early June of 2024, the school flew the Progress Pride flag on the flag pole where the national flag normally flies, in order to comply with a request from the Simcoe County District School Board's diversity, equity, and inclusion (DEI) department. Many students and parents reported being upset with this decision, believing it is only appropriate to fly the national flag. Chris Hutton, an OSS student who identifies as bisexual and transgender, started a petition to replace it with the Canadian flag again, stating the decision "led to an increase in bullying of students from the 2SLGBTQ+ community". Two days after creating the petition, Hutton claimed "theyre threatening to call the cops on me and I cant continue with this at this time" [sic].