Hayley Dee Westenra is a New Zealand classical crossover singer. Her first internationally released album, Pure, reached number one on the UK classical charts in 2003 and has sold more than two million copies worldwide, making it one of the fastest selling albums in her country's history. 

Westenra was born on 10 April 1987 at Christchurch Women's Hospital in Christchurch, New Zealand. Her parents, Gerald and Jill Westenra, have two younger offspring, Sophie and Isaac. Sophie is an academic and teaches law at Oxford. Westenra's grandmother Shirley Ireland was a singer, and her grandfather was a pianist who also played the piano accordion. She has Irish, Dutch and English heritage.

In 2013, Westenra married French-born Arnaud Sabard, who worked as a sound engineer during her tours.