Agnes Keyser, DStJ, RRC (11 July 1852 – 11 May 1941) was a humanitarian, courtesan and longtime mistress to Edward VII, King of the United Kingdom. Keyser was the wealthy daughter of a Stock Exchange member. She remained with the King until his death in 1910. Keyser, as recorded by author Raymond Lamont-Brown in his book Edward VII's Last Loves: Alice Keppel and Agnes Keyser, held an emotional bond with the King that others did not, due to her being unmarried herself, and preferring a more private affair to a public one.