Nathalie Boltt (born 19 July 1973) is a South African actress known for Riverdale and District 9. Her initial break into acting was in her birth country, South Africa, as Joey Ortlepp on the SABC 3 drama Isidingo from 2001 to 2004.

Internationally, she portrayed Penelope Blossom on The CW's teen drama series Riverdale from 2017 to 2023. She has been seen in the films District 9, Demonic, and the 2005 television remake of The Poseidon Adventure. She also voices the character of DottyWot in the New Zealand children's series The WotWots.