Dame Imelda Mary Philomena Bernadette Staunton (born 9 January 1956) is an English actress and singer. After training at the Royal Academy of Dramatic Art, Staunton began her career in repertory theatre in 1976 and appeared in various theatre productions in the United Kingdom. Over her career, she has received several awards including a British Academy Film Award, and four Laurence Olivier Awards as well as nominations for an Academy Award, three British Academy Television Awards, three Golden Globe Awards, and three Emmy Awards.

Known for her many roles on the West End stage, Staunton has received thirteen Laurence Olivier Award nominations, winning the Best Supporting Role in a Play for her work in both A Chorus of Disapproval / The Corn Is Green (1985) followed by three wins for Best Actress in a Musical for her roles in the musicals Into the Woods (1991), Sweeney Todd (2013), and Gypsy (2016). She was also Olivier-nominated for The Beggar's Opera (1982), The Wizard of Oz (1988), Uncle Vanya (1988), Guys and Dolls (1997), Entertaining Mr Sloane (2010), Good People (2015), and Follies (2018).

On film, Staunton took early roles in films such as Peter's Friends (1992), Much Ado About Nothing (1993), Sense and Sensibility (1995), and Shakespeare in Love (1998). Staunton won a BAFTA Award for playing the title role of a working class woman in Vera Drake (2004). She later gained a wider audience for her role as Dolores Umbridge in the Harry Potter films The Order of the Phoenix (2007) and The Deathly Hallows - Part 1 (2011). She also acted in Nanny McPhee, Another Year (2010), Pride (2014), and Downton Abbey (2019), and provide voiced roles in Chicken Run (2000), Arthur Christmas (2011), and Paddington (2014).

On television, Staunton starred in the sitcoms Up the Garden Path from (1990–1993) and Is it Legal? (1995–1998). She received Primetime Emmy Award and British Academy Television Award nominations for her portrayals of Alma Hitchcock in the HBO television film The Girl (2012) and Queen Elizabeth II in the Netflix historical series The Crown (2022–2023). Staunton also took roles in Antonia and Jane (1990), Citizen X (1995), David Copperfield (1999), My Family and Other Animals (2005), Return to Cranford (2007), and Flesh and Blood (2020).