Bonnie Aarons is an American actress. She is best known for her roles as the Nun, a personification of the demon Valak, in The Conjuring Universe (2016–present), starring in The Conjuring 2 (2016), The Nun (2018) and The Nun II (2023). Other roles include the bum in Mulholland Drive (2001), Baroness Joy von Troken in The Princess Diaries (2001) and its sequel, The Princess Diaries 2: Royal Engagement (2004).

The Conjuring Universe is an American horror franchise and shared universe centered on a series of supernatural horror films. The franchise is produced by New Line Cinema, Atomic Monster, and the Safran Company, and distributed by Warner Bros. Pictures. The films present a dramatization of the supposed real-life adventures of Ed and Lorraine Warren, paranormal investigators and authors associated with prominent yet controversial cases of haunting. The main series follows their attempts to assist people who find themselves harassed by spirits, while the spin-off films focus on the origins of some of the entities the Warrens have encountered.