Alexandra Elizabeth Kingston (born 11 March 1963) is an English actress, who trained at the Royal Academy of Dramatic Art in London. Active from the early 1980s, Kingston became noted for her television work in both Britain and America in the 1990s, including her portrayal of the title role in the British miniseries The Fortunes and Misfortunes of Moll Flanders (1996) and her regular role as Dr. Elizabeth Corday in the NBC medical drama ER (1997–2004).
Later credits include the recurring role of River Song in the BBC science fiction series Doctor Who (2008–2015), Mrs. Bennet in the ITV1 period-drama fantasy Lost in Austen (2008) and Dinah Drake Lance in The CW's Superhero fiction drama series Arrow (2013–2016).
Kingston was born and brought up in Epsom, Surrey, the eldest of three daughters of an English butcher, Anthony Kingston, and his German wife, Margarethe (née Renneisen). Kingston's paternal great-great-grandmother was Jewish, an ancestry Kingston explored on the series Who Do You Think You Are? Kingston's uncle, her mother's younger brother, is actor Walter Renneisen. Her sisters are Susie, who is mentally and physically disabled as a result of being deprived of oxygen at birth, and Nicola, a former actress who appeared in the 1996 British TV production of The Fortunes and Misfortunes of Moll Flanders, in which Kingston starred.