Members of the Orange Lodge from Eastern Ontario and Western Quebec marched to mark the 1690 battle in which James VII of Scotland and James II of England were defeated by William III.
The battle, marked by marches on July 12 and known simply as "the Twelfth," is now recognized by the Orange Institution as a major turning point in religious freedom for Protestants.
"It's all about religious freedom, and that's what we stand for. Be proud of your country, be proud of your Protestant faith," said Kevin Bradley, Twelfth of July Committee Chairman.
"I grew up in an Orange family, and I like to commemorate the 12th of July, the Battle of Boyne," said Richmond, Ont. resident Helen Wilson.
Thousands of people attended Orange parades across Northern Ireland today. Historically the catalyst for provoking Catholic-Protestant tensions, the event this year was marred by news that more than a dozen police officers were injured during violent clashes.
Orangemen from Australia, the United States and Canada marched in commemoration.
The battle is celebrated every year in Carleton Place.