Anna-Louise Plowman (born 9 May 1972) is a New Zealand-born actress.

Plowman was born in New Zealand to British parents. She attended Samuel Marsden Collegiate School, Wellington, between 1982 and 1989, and then the London Academy of Music and Dramatic Art and the Lecoq School in Paris.^[1]

She played consultant anaesthetist Annalese Carson in Holby City and Sarah Gardner/Osiris in Stargate SG-1. In 2003 she played Melinda MacLean, wife of British communist spy Donald Maclean, and mistress of spy Kim Philby (played by her husband Toby Stephens), in the TV mini-series Cambridge Spies.

She played Diana Goddard in the Doctor Who story "Dalek" in 2005. Plowman also played the role of "C" in a revival of Edward Albee's play, Three Tall Women, in 2006, at the Oxford Playhouse.

From 2016 to 2017, she played chamber maid Mrs Hudson in the series Black Sails, which also starred Toby Stephens.

Plowman married actor Toby Stephens, who is the son of actors Maggie Smith and the late Robert Stephens, in London, in 2001. In May 2007, Plowman and Stephens had their first child, a son named Eli Alistair.^[2] Simon Gray, the renowned British playwright (who wrote Japes, a stage play, and Missing Dates, a radio drama, both of which starred Stephens), was Eli's godfather.^[3][4] Their daughters, Tallulah and Kura, were born in May 2009^[5] and in September 2010, respectively.

Plowman and Stephens performed together as Sibyl and Elyot in Jonathan Kent's revival of Private Lives for the 2012 Chichester Festival,^[6] reprised at the Gielgud Theatre in 2013.^[7][8]