Hayley Dee Westenra (born 10 April 1987) is a New Zealand classical crossover singer and songwriter. 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.

She is one of the youngest UNICEF Ambassadors to date.

Westenra has sung in English, Māori, Irish, Welsh, Spanish, Italian, German, French, Portuguese, Latin, Japanese, Standard Mandarin Chinese, Catalan, and Taiwanese Hokkien.