Lady Astor commonly refers to Nancy Astor, Viscountess Astor (1879–1964).
Lady Astor may also refer to:
Viscountess Astor Sarah Baring (1920–2013), 1st wife of the 3rd Viscount Astor Phillipa Victoria Hunloke, 2nd wife of William Astor, 3rd Viscount Astor Bronwen Astor (1930–2017), 3rd wife of the 3rd Viscount Annabel Astor, Viscountess Astor (born 1948), wife of William Astor, 4th Viscount Astor
Baroness Astor of Hever Violet Astor (1889–1965), wife of John Jacob Astor, 1st Baron Astor of Hever Irene Astor, Baroness Astor of Hever (1919–2001), wife of Gavin Astor, 2nd Baron Astor of Hever Fiona Diana Lennox-Harvey, 1st wife of John Astor, 3rd Baron Astor of Hever Liz Astor, Baroness Astor of Hever (born 1950), 2nd wife of 3rd Baron
See also Lord Astor (disambiguation)