Charlotte Julia Ronson (born 7 August 1977) is an English fashion designer, currently based in New York City.

Ronson was born the daughter of writer and socialite Ann Dexter-Jones and real estate mogul Laurence Ronson. She has said that her mother was strict when she was growing up and would not let her attend concerts.

She is related to politicians Malcolm Rifkind and Leon Brittan, and is the niece of businessman Gerald Ronson. Her parents are of Ashkenazi Jewish descent, with ancestors from Russia, Lithuania andAustria. Ronson's family name was originally Aaronson but her grandfather Henry Ronson changed it to Ronson.

She has two siblings, twin sister Samantha Ronson, who is a DJ, and older brother Mark Ronson, who is a music producer, singer/songwriter, and DJ as well. Ann Dexter-Jones and Laurence Ronson divorced. Ronson's mother re-married, to Mick Jones of Foreigner, and the family relocated to New York. Ronson has five half-siblings by her parents' remarriages.