The Queen has been buried at Windsor Castle alongside her late husband, Prince Philip, in a private ceremony.
"The Queen was buried together with The Duke of Edinburgh, at The King George VI Memorial Chapel," a statement on the royal family's website read. The private burial was conducted by the Dean of Windsor.
Prince Philip died last year aged 99.
It comes after the United Kingdom and the world bade farewell to Queen Elizabeth II overnight with a state funeral that drew presidents and kings, princes and prime ministers - and crowds in the streets of London and at Windsor Castle - to honour a monarch whose 70-year reign defined an age.
King Charles III and senior royal family members attended the internment ceremony.
The King George VI Memorial Chapel is an annex within St George's Chapel, a gothic church on the grounds of Windsor Castle that has hosted royal weddings, christenings and burials since the 15th century.
Earlier 800 mourners, many of them the Queen's staff, joined royal family members in the chapel for a committal service.
The royal family's mourning period will continue until September 26.
When Philip, the Queen's husband of 73 years, died last year, his coffin had been placed in a different part of St George's Chapel, ready to be moved to the memorial chapel to join the Queen when she died.
Elizabeth II's parents, King George VI and Queen Elizabeth, were also interred there along with the ashes of Princess Margaret, the late monarch's younger sister who died in 2002.
St George's is the resting place of 10 former British monarchs, including Henry VIII and the beheaded Charles I. It is also the home of the Order of the Garter, an ancient order of chivalry founded by King Edward III in 1348.
Last year the Queen bid farewell to Philip at St George's in a "Covid-secure" funeral. The ceremony to mark the death of Philip was muted because of strict pandemic restrictions, and only 30 mourners were allowed inside the chapel at the time.
St George's and Windsor featured prominently throughout the Queen's life. The chapel was where she marked many a Christmas and Easter, and where she celebrated the weddings of three of her grandchildren: Prince Harry married Meghan Markle there in 2018, as did Princess Eugenie and Jack Brooksbank. Peter Philips, the Queen's oldest grandchild, married Autumn Kelly there in 2008.
The Queen spent most of her weekends in Windsor, a quiet and more private retreat away from the bustle of Buckingham Palace in central London.
The castle — believed to be the largest occupied castle in the world — was also where young Princesses Elizabeth and Margaret were sent to live during World War II while their parents were busy with the war effort.
In recent years the Queen made Windsor Castle her main residence, having moved there in early 2020 at the start of the coronavirus pandemic.