The Duke of Edinburgh was welcomed by Governor General David Johnston.
On Saturday, Prince Philip will be at the provincial legislature to take part in a breakfast reception with Ontario Premier Kathleen Wynne and Lieut/-Gov. David Onley.
He will then present a new regimental colour to the Third Battalion of the Royal Canadian Regiment on the grounds of Queen's Park.
Maj. Derrick Wessan says the regiment is "honoured ... to have our colonel-in-chief available to officiate this ceremony in the great city of Toronto. I can't tell you how awesome this is going to be."
Regimental colours are a kind of ceremonial flag considered the most prized possession of every regiment.
The prince has served as the regiment's colonel-in-chief — an honorary title often bestowed on members of the Royal Family — since 1953.
Later on Saturday, more than 100 Royal Canadian Regiment troops will join more than 1,700 other soldiers in a military march through the streets of Toronto.
The parade will finish at Fort York, where troops will gather for a ceremony commemorating the 200th anniversary of the Battle of York.
Master Cpl. Dave Mitchell is looking forward to the day.
"It's a good experience — especially to be able to do it in front of so many people. I think it'll be good for our unit altogether to show people basically what we're all about," he said.
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