Up to 25 protestors are attempting to elude police and break through security barriers on the Mall ahead of Trooping the Colour.
The officers pounced as they dashed over obstacles to the location where the parade would take place momentarily.
As the marching band came, two of the protesters, from Animal Rebellion, were permitted to sit in the middle of the Mall.
Officers dragged them out of the road as the musicians walked past, completely ignoring them.
Minutes later they proudly tweeted: ‘Animal Rebels disrupt the Queen’s Platinum Jubilee celebrations demanding that Royal Land is Reclaimed.
‘This summer, we’re taking bigger action against the Dairy industry than ever before, and we need you.’
They posted on Instagram the moment they vaulted over the fences into the road.
Beau King Houston, amongst those taking action, said ‘The Royal family has had decades to lead the way on a just transition to plant-based farming and has failed to do so.
‘This transition is common sense and simple, we all win. 76% of currently farmed land could be rewilded and absorb carbon from the atmosphere.
‘This would restore nature, spare billions of animals, and present a solution to the climate emergency, all in one act.’
The activists have accused the Crown – one of the largest land owners in the country – continuing to support the meat, fishing, and dairy industry.
Protesters say these sectors and industries are leading contributors to the climate crisis.
A spokesman for the Metropolitan Police said: ‘A number of arrests have been made of people who attempted to enter the ceremonial route in The Mall at approximately 10.10am today.
‘The arrests were public order related for highway obstruction.’
Thousands of people draped in Union Jack flags, party hats and plastic tiaras are lined the Mall in the warm sunshine to watch the Trooping the Colour.
Some of those at the front brought camping chairs, having arrived as early as 8pm on Wednesday to get the best spot.
Spirits were high among the crowds as members of the public chatted and joked with police maintaining the perimeter.
Several handmade signs hung over the barriers, with one simply saying, ‘thank you’.
Devoted royalists will watch from the famous street leading up to Buckingham Palace from Trafalgar Square for the traditional Trooping the Colour.
The military ceremony – which has been used to mark a British Monarch’s official birthday for 260 years – will be carried out by 1st Battalion Irish Guards, plus more than 1,500 officers and soldiers from the Household Division.
Prince Charles will take the Salute, joined by Prince William, a Colonel in the regiment and Princess Anne.
Royal fans across the country who aren’t lucky enough to have a space along The Mall can watch events unfold on huge screens in nearby St James Park, or in Princes Street Gardens in Edinburgh or Bute Park in Cardiff.
More than 350 horses and hundreds of military musicians will be involved in the procession, in which members of the Royal Family will travel on horseback and in carriages down the Mall to Horse Guards Parade, where the ceremony takes place.
In a show of the resilience that has marked her record-breaking reign, the Queen has vowed to make two appearances on the Buckingham Palace balcony today, the first day of her Jubilee celebrations.