Jill Halfpenny (born 15 July 1975) is an English actress, best known for her roles as Rebecca Hopkins in the British soap opera Coronation Street (1999–2000); Kate Mitchell (née Morton) in rival soap EastEnders (2002–05); Izzie Redpath in Waterloo Road (2006–07); and Diane Manning in In The Club (2014–16). She also won the second series of the television dance contest Strictly Come Dancing in 2004.
Her career began in 1989 with a regular role in the BBC children's drama series Byker Grove. She has subsequently appeared in numerous TV roles, such as Peak Practice, Mount Pleasant, Wild at Heart, Lightfields, Babylon, Humans, Three Girls, and Liar.
She has also enjoyed a successful theatre career, with roles ranging from pantomime to the West End, in productions such as Uncle Vanya, Calendar Girls, Abigail's Party, and musicals like Chicago. In 2011, she won the Theatregoers' Choice Award for Best Supporting Actress in a Musical and the Laurence Olivier Award for Best Performance in a Supporting Role in a Musical for her portrayal of Paulette in Legally Blonde.