Public holidays
1666, Canada, Ontario
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | New Year's Day |
| 2 | Monday, 15 February 1666 | Family Day |
| 3 | Friday, 16 April 1666 | Good Friday |
| 4 | Monday, 24 May 1666 | Victoria Day |
| 5 | Thursday, 1 July 1666 | Canada Day |
| 6 | Monday, 6 September 1666 | Labour Day |
| 7 | Monday, 11 October 1666 | Thanksgiving |
| 8 | Saturday, 25 December 1666 | Christmas |
| 9 | Sunday, 26 December 1666 | Boxing Day |
| Monday, 27 December 1666 | Christmas (observance) | |
| Tuesday, 28 December 1666 | Boxing Day (observance) |