Geraldine Viswanathan (/ˌvɪswəˈnɑːθən/ VISS-wə-NAH-thən; Tamil: ஜெரள்டீன் விஸ்வநாதன்; born 20 June 1995) is an Australian actress. She gained recognition for her roles in the films Blockers (2018), Hala (2018), Bad Education (2019), and Thunderbolts* (2025). She had a recurring role in the series Janet King (2017) and starred in the TBS comedy anthology Miracle Workers (2019–2023).