Elliot Lake Secondary School (ELSS) is a high school in Elliot Lake, Ontario, Canada. The school began in 1956 with 23 students and quickly grew to 1193 students by 1990. The following year, the school only saw an enrollment of 899 students and the institution's population would continue to drop thereafter. As of September 2009, the enrolment was 483. The school's athletic teams are known as the "Atoms" in reference to the uranium mines that were the towns principle employer.