Ingersoll District Collegiate Institute (aka I.D.C.I.) is a public high school in Ingersoll, Ontario. As the only high school in Ingersoll, it also serves the village of Thamesford, and the rural areas surrounding both communities. It is in the Thames Valley District School Board (TVDSB). It is located in the north end of the town on Alma street. Historian and educator J.C. Herbert was a long-term principal of the school, where he has an award named after him.