Prince Charles and head of the army General Sir Mike Jackson were guests at a service at London's Cenotaph - the first of a series of events around the UK to commemorate VE Day.
Hundreds of veterans remembered their fallen colleagues at the Cenotaph service.
Later, the prince and the Duchess of Cornwall met servicemen at a parade and service at Hyde Park's Cavalry Memorial.
A number of street parties were held across the UK including one outside the Churchill Museum in Westminster, London.
Youngsters dressed in period costume during a memorial service at St Andrew's Cathedral, Dundee.
War veterans marched through Dundee before the service at the cathedral.
Former Prime Minister Baroness Thatcher took the salute at a parade of servicemen at Chichester Cathedral.
At 2000 BST, a Dakota DC3 flew at 1,500 feet over Trafalgar Square to mark the beginning of a BBC concert
Up to 15,000 people watched A Party to Remember, headlined by Will Young and Katie Melua.
Welsh singer Katherine Jenkins sported a 1940s outfit and hairstyle for her performance.
Dame Vera Lynn, known as the forces' sweetheart after singing wartime anthems like We'll Meet Again, also joined in with the celebrations.