Twin Lakes Secondary School (also known as TLSS or just Twin) is a secondary school located in Orillia, Ontario.

[2] After the March 2008 review process that consolidated Orillia's three public high schools into two buildings as a result of cost of maintenance of the aging buildings and the declining enrollment at Park Street Collegiate Institute, Twin Lakes is now one of Orillia's 2 public secondary schools.

(Area B schools- Orillia, Oro-Medonte & Ramara and Springwater).

TLSS has: Extended French, Life and Skills courses, Co-operative education programs, music, art and drama programs, transportation, construction, yearbook, and computer technology.

Boys'/Girls' Soccer, Boys'/Girls' Rugby, Boys'/Girls' Hockey, Boys'/Girls' Basketball, Boys'/Girls' Volleyball, Track & Field, Girls' Flag Football, Nordic Skiing, Swim Team