A system for partitioning an environment (S) including a ceiling (C) defining a first plane (π) and a floor (F) or false floor (FF), the system (1) comprising at least one first upper longitudinal profile (50) defining a first axis (X) couplable with the ceiling (C); at least one second lower longitudinal profile (80) defining a second axis (Χ') operatively couplable with the floor (F) or false floor (FF) placed in correspondence to said at least one first upper longitudinal profile (50); at least one fixed partition wall (20, 30) having a first upper portion (20', 30') operatively couplable with the upper longitudinal profile (50) and a first lower portion (20", 30") operatively couplable with the second lower longitudinal profile (80); at least one door (40) having an upper portion (44) operatively couplable with the upper longitudinal profile (50) and an opposite lower portion (45) facing the floor (F) or false floor (FF); at least one first and one second accessory (60, 63) selectively engageable with the upper longitudinal profile (50) to respectively couple the fixed wall (20, 30) and the door (40) with the upper longitudinal profile (50) thereof. The fixed wall (20, 30) and the door (40) are slidably coupled with the upper longitudinal profile (50) to slide along a plane (π') substantially perpendicular to the plane (π) so as to allow a user to place the fixed wall (20, 30) and the door (40) with the respective lower portions (20", 30", 45) aligned along a line substantially parallel to the floor (F) or false floor (FF), the line having a predetermined distance (h) from the floor (F) or false floor (FF).