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Helena Bonham Carter (born 26 May 1966) is an English actress. She is known for her character roles as eccentric women in blockbusters and independent films, particularly period dramas. Bonham Carter rose to prominence by playing Lucy Honeychurch in A Room with a View (1985) and the title character in Lady Jane (1986). Her early period roles saw her typecast as a virginal "English rose", a label with which she was uncomfortable. Bonham Carter is recognized for her unconventional fashion choices and dark aesthetic. For her role as Kate Croy in The Wings of the Dove (1997), Bonham Carter received a nomination for the Academy Award for Best Actress, and for her portrayal of Queen Elizabeth in The King's Speech (2010), she won the BAFTA Award for Best Actress in a Supporting Role, and was nominated for the Academy Award for Best Supporting Actress.

Bonham Carter's other films include Hamlet (1990), Howards End (1992), Mary Shelley's Frankenstein (1994), Mighty Aphrodite (1995), Fight Club (1999), Wallace & Gromit: The Curse of the Were-Rabbit (2005), the Harry Potter series (2007–2011), Great Expectations (2012) as Miss Havisham, Les Misérables (2012), Cinderella (2015), Ocean's 8 (2018), and Enola Holmes (2020). Her collaborations with director Tim Burton include Big Fish (2003), Corpse Bride (2005), Charlie and the Chocolate Factory (2005), Sweeney Todd: The Demon Barber of Fleet Street (2007), Alice in Wonderland (2010), and Dark Shadows (2012).

For her role as children's author Enid Blyton in the BBC Four biographical film Enid (2009), Bonham Carter won the 2010 International Emmy Award for Best Actress and was nominated for the British Academy Television Award for Best Actress. Her other television films include Fatal Deception: Mrs. Lee Harvey Oswald (1993), Live from Baghdad (2002), Toast (2010), and Burton & Taylor (2013). From 2019 to 2020, Bonham Carter portrayed Princess Margaret in seasons three and four of Netflix's The Crown earning two Primetime Emmy Award nominations.