Veterans have spent the morning gathering near Guards Memorial on the Horse Guards Parade ahead of the Royal British Legion’s March Past the Cenotaph.
At 11:00, Big Ben will chime to signal the start of the two-minute silence. It will be ended by the sound of a cannon blasting from Horse Guards Parade followed by a bugler playing the Last Post.
Services will be held in almost every town and city across the UK – with some of the biggest gatherings expected in Belfast, Edinburgh, Cardiff, Plymouth, Liverpool and Manchester.
In Belfast, Northern Ireland’s First Minister Michelle O’Neill is due to take part in the official ceremony, making her the first senior Sinn Féin figure to do so.
Several Sinn Féin politicians have laid wreaths at the Cenotaph in Belfast in previous years, but they have not attended the main Sunday ceremony.