Kirsty Bertarelli (née Roper; born 30 June 1971) is a British songwriter and beauty pageant titleholder who won Miss United Kingdom 1988 and represented her country at Miss World 1988 and placed 2nd Runner-up, she is former wife of Ernesto Bertarelli an Italian-Swiss businessman who was the owner of biotech giant Serono until 2007 and winner of the America's Cup in 2003 and 2007 with his yachting syndicate Alinghi.

In the Sunday Times Rich List 2017 ranking of the wealthiest people in the UK, her former husband's family were placed 6th with an estimated fortune of £11.5bn, making her Britain's richest woman. In Swiss BILANZ magazine's ranking of the wealthiest people in Switzerland, her former husband's family were placed 4th with an estimated fortune of over CHF11 billion.