Countess Spencer may refer to:
Georgiana Spencer, Countess Spencer (1737–1814), wife of John Spencer, 1st Earl Spencer Charlotte Spencer, Countess Spencer (1835–1903), wife of British Liberal politician Viscount Althorp Cynthia Spencer, Countess Spencer (1897–1972), paternal grandmother of Diana, Princess of Wales Raine Spencer, Countess Spencer (1929–2016), stepmother of Lady Diana Frances Spencer Victoria Aitken (formerly Victoria, Countess Spencer; born 1965), sister-in-law of Diana, Princess of Wales Caroline Hutton (born 1966), sister-in-law of Diana, Princess of Wales Karen Spencer, Countess Spencer (born 1972), sister-in-law of Diana, Princess of Wales