The doors of Westminster Abbey have been opened so that guests and foreign dignitaries can take their seats ahead of the coronation ceremony.
More than 2,000 people are expected inside the Abbey with representation from 203 countries and over 100 heads of state having accepted invitations to attend proceedings, among them Germany's Frank-Walter Steinmeier.
US first lady Jill Biden will be attending in the absence of US President Joe Biden.
King Charles along with the Queen consort will be making their way in procession from Buckingham palace to Westminster Abbey where they will be crowned at 10:00 UTC.
The coronation process will take place along a 1.3 mile (2.09 kilometer) route.
In London, large crowds of royal fans have been building up during the week, gathering along The Mall outside Buckingham Palace.
It's an indication that the royals still occupy a central role in British culture and history.
Many who have been camping out to witness the coronation have flown in from abroad, highlighting the royal family's standing as Britain's leading global brand, despite a number of scandals over the years.
More than 11,000 police have been deployed in the capital, ready to respond to any attempted disruptions.
Thousands of personnel from the British Armed Forces are making their way to positions be part of proceedings, with troops seen arriving and moving on from London's Waterloo station.
They have been conducting overnight rehearsals on the streets of London in the days leading up to the coronation.