The annual procession marks the monarch's official birthday, with Charles carrying out an inspection of the military parade, with the Coldstream Guards trooping their colours this year.
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For a second year in a row, the King rode in the carriage procession alongside his wife, Camilla, instead of riding horseback and as a mark of respect, senior officers and those riding in the parade wore black armbands to pay tribute to those who died in the Air India crash.
Following the parade, the royals returned to Buckingham Palace to watch a spectacular finale from the balcony, with the Red Arrows making history as they used sustainable fuel and vegetable oil for their flypast.
The Princess of Wales chose a deep aquamarine wool coatdress by Catherine Walker with ivory contrast lapels and cuffs.
She accessorised with a matching aquamarine hat by Juliette Botterill, her Irish Guards Regimental Brooch and the late Queen's pearl and diamond drop earrings.
A closer look at Sophie's outfit by Beulah London. The Duchess rode alongside the Princess Royal's husband, Vice Admiral Sir Tim Laurence, in the No.1 Barouche carriage.
William wore the Full Ceremonial Guard Order of the Welsh Guards, while Anne donned the Full Mounted Ceremonial uniform of the Blues and Royals (Royal Horse Guards and 1st Dragoons). The Princess carried the Gold Stick as Gold Stick-in-Waiting for this year’s parade.
The monarch wore the Uniform of the Regiment Trooping the Colour which is the Coldstream Guards (Coldstream Guards Tunic and Forage Cap). The Sovereign wears the uniform of whichever Regiment’s Colour is being trooped.
His Majesty’s uniform bears the cypher Queen Elizabeth II as His Majesty was Personal Aide-de-Camp to Her Majesty Queen Elizabeth II.
And in a poignant nod to those killed in the Air India crash, Charles donned a black armband.
The Princess returned to watching the parade on the dais with the King and Queen. Last year, she watched proceedings from a Ministry of Defence building overlooking Horse Guards Parade as she was still undergoing cancer treatment.
A minute's silence was observed during Trooping the Colour in honour of those killed in the Air India plane crash.
All attendees were asked to stand during the commemoration at Horse Guards Parade in central London.
Charles requested the moment of reflection be added to the Trooping the Colour programme "as a mark of respect for the lives lost, the families in mourning and all the communities affected by this awful tragedy", a Buckingham Palace spokesperson said.
The King and Queen were joined by the senior royals as they gathered on the balcony to watch the flypast - including the Duke of Kent, who did not participate in the carriage procession.
Trooping the Colour is a military ceremony performed by regiments of the British Army to celebrate the official birthday of the British sovereign. While Charles' actual birthday is 14 November, official celebrations always take place in June.
When is it held?
In 2025, it is scheduled for Saturday 14 June.
Where is it held?
Central London, with the procession route travelling from Buckingham Palace to Horse Guards Parade, along The Mall, and back again.
Who attends?
King Charles III (in recent years, he has participated on horseback).
Household Division: including the Foot Guards and Household Cavalry.
Senior royals, such as the Princess Royal and the Prince of Wales often ride on horseback or appear on the palace balcony - like the Princess of Wales
Why is it called Trooping the Colour?
One regiment's colours (flag) are "trooped" (carried) before the monarch. The event ends with an RAF flypast over Buckingham Palace, viewed by the royal gamily from the balcony.
Historical roots:
It dates back to the 17th century and became an annual event to mark the sovereign’s official birthday under King George III in the 18th century.
Official celebrations to mark the sovereigns' birthday have often been held on a day other than their actual birthday, particularly when the day has not fallen on a day in the summer.
Where can I watch it?
The ceremony is broadcast live by the BBC and covered globally.
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WATCH: Royals watch the flypast
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