It is the first coronation of a British monarch in 70 and the first of a king in 86 years.
King Charles and Camilla arrive at Westminster Abbey at around 11.50am and the service begins at 12pm.
More than 2300 guests will follow the coronation. Representatives from 203 countries are expected, including around 100 heads of state. Federal President Alexander Van der Bellen will represent Austria.
We are currently reporting: