Fantine Harduin (born 23 January 2005 in Mouscron) is a Belgian actress. She began her career in television and film during her childhood, notably appearing in the series Spiral (Engrenages, 2014) and the drama film Fanny's Journey (Le Voyage de Fanny, 2016). She achieved international recognition for portraying the role of Eve in Michael Haneke's Happy End (2017), which screened in the official competition at the Cannes Film Festival. She continued her film career starring in the science fiction film A Breath Away (Dans la brume, 2018), and then playing the lead role of Gloria in Fabrice Du Welz's Adoration (2019), a performance that received critical acclaim. On television, she played the title roles in the miniseries L'Absente (2021) and Prométhée (2022). More recently, she starred in the international series Paris Has Fallen (2024) and portrays Cécile de Volanges in the series Merteuil (2025).

Filmography