Olivia Jane Grierson (née Chenery; born 11 March 1989) is an English actress and environmental advocate. Her films include Brotherhood (2016) and 10x10 (2018). On television, she is known for her roles in the BBC series Queens: The Virgin and the Martyr (2017) and the Sky One series Bulletproof (2020–2021).

Chenery was born in the South London Borough of Croydon to parents Emma and Julian. She has two sisters. She joined the National Youth Theatre and went on to study at the London School of Musical Theatre, graduating in 2010.