Résumé : Traffic and théǎtromanie in a period of beautification: mobility issues in plans for theatres in Brussels (1785-1792)This paper aims to show how, in a context of théǎtromanie (avid theatregoing) in the second half of the 18th century, plans for theatres and for the beautification of towns allowed for the development of new architectural, urbanism, and regulatory solutions to the mobility issues raised by the arrival and departure of hundreds of theatregoers afoot or by carriage. As a case study, we will look at theatre plans for Brussels between 1785 and 1792, analysed using a multi-scale approach (the building, its district and the city).