The Leonora Children's Cancer Fund was a British registered charity that was registered on 14 September 1994. It was, until 11 March 2010, registered charity number 1040757, when it was removed from the register following its merger with The Edwina Mountbatten Trust, registered charity number 228166. The merged charities were renamed The Edwina Mountbatten and Leonora Children's Foundation on 20 February 2014 . The Edwina Mountbatten Trust was a charity founded in memory of Leonora's great grandmother. The charity provided specially trained nurses to help look after children with childhood cancer. The charity continues to fund nurses looking after children.
The Fund was established by Lord and Lady Romsey, now Lord and Lady Brabourne, in memory of their daughter Leonora Knatchbull, who died, aged five, from a kidney tumour in 1991.