Nouns ending in -teur are usually masculine.
The suffix names a person or thing that performs an action.
Is acteur masculine or feminine?
l'acteur
The feminine form is actrice
The rule behind it
95.8% of -teur nouns are masculine
The feminine form is actrice
FrenchTextbook teaches rules like this, in a full beginner course.
162 lessons, 4,000+ exercises, and 6+ hours of audio.
Try the first lesson free