Petula Sally Olwen Clark, CBE (born 15 November 1932) is a British singer, actress, and songwriter. She has had one of the longest careers of any British singer, spanning more than seven decades.

Clark's professional career began during the Second World War as a child entertainer on BBC Radio. In 1954 she charted with "The Little Shoemaker", the first of her big UK hits, and within two years she began recording in French. Her international successes have included "Prends mon coeur", "Sailor" (a UK number one), "Romeo", and "Chariot". Hits in German, Italian and Spanish followed. In late 1964 Clark's success extended to the United States with a four-year run of career-defining, often upbeat singles, many written or co-written by Tony Hatch and Jackie Trent. These songs include her signature song "Downtown", "I Know a Place", "My Love", "A Sign of the Times", "I Couldn't Live Without Your Love", "Who Am I", "Colour My World", "This Is My Song" (by Charles Chaplin), "Don't Sleep in the Subway", "The Other Man's Grass Is Always Greener", and "Kiss Me Goodbye". In the US, Clark was sometimes called "the First Lady of the British Invasion".

Clark has sold more than 68 million records. She has also enjoyed success in the musical film Finian's Rainbow and in the stage musicals The Sound of Music, Blood Brothers, Sunset Boulevard and Mary Poppins.