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.