The word for ‘gentlemen’ in French is messieurs.
This term is the plural form of ‘monsieur’, which means ‘mister’ or ‘sir’. In French, it is common to address a group of men or to refer to men in a formal context using ‘messieurs’. For instance, when addressing a group of gentlemen or referring to them in writing, you would use this term to show respect.
Keep in mind that in informal situations, you might refer to men simply as ‘les gars’ or ‘les hommes’, but ‘messieurs’ is the proper and polite form if you’re looking for a formal address.