A modular turret for an armored vehicle, on the one hand comprising an invariable and unique basic structural unit able to be interchangeable, called standard shell, equipped with interface means, and on the other hand, a plurality of interchangeable and removable functional modules and/or systems ( 5, 6, 8, 12, 21, 22, 23), able to be secured to the standard shell by specific fastening means distinctive from the connection of each functional module to said standard shell, the interface means thus being designed to allow the assembly of the set of different modules and/or systems of the same functional type on said standard shell at an interfacing zone on the latter, said standard shell comprising the assembly of a plurality of plates with different shapes and sizes giving the standard shell a geometric shape with fixed dimensions, said plates being able to have orifices and/or connectors for fastening said interchangeable and removable functional modules and/or systems, said plurality of plates at least comprising: - a base metal sheet making up the base of the standard shell over the entire surface area thereof, and the center of which is pierced to define the fastening of a ring; - two cannon support plates situated in front of the standard shell, and positioned perpendicular relative to the base metal sheet, each of the plates comprising an orifice intended to receive a cannon module and/or secondary weapon module; - side metal sheets starting from the cannon support plates, following the base metal sheet to end behind the standard shell; - an interface plate connecting the side metal sheet to the rear of the standard shell perpendicular to the base metal sheet, said interface plate being a fastening means for a bustle rack; - upper metal sheets cooperating with the cannon support plates, the side metal sheets and the interface plate to close the standard shell; said standard shell being characterized in that it further comprises: - two arches providing the junction between the front and rear of the standard shell, having a fixed height and forming a rectilinear channel extending from the cannon support plates to the interface plate, so that said arches define, inside the standard shell, three invariable zones from a functional and structural perspective, independently of the actual cannon module, i.e., a zone for hosting the gunner on the right, looking from the front of the vehicle, a zone for hosting the commander on the left, and a central zone intended to receive the primary weapon, the position of the arches defining fictive plans which, once extended downward with respect to the base metal sheet, make similarly appear the three aforementioned zones at the level of a basket optionally mounted on the standard shell; and - a cover, over the arches, the shape and/or height of which depending on the recoil created by the cannon module. - a base metal sheet making up the base of the standard shell over the entire surface area thereof, and the center of which is pierced to define the fastening of a ring; - two cannon support plates situated in front of the standard shell, and positioned perpendicular relative to the base metal sheet, each of the plates comprising an orifice intended to receive a cannon module and/or secondary weapon module; - side metal sheets starting from the cannon support plates, following the base metal sheet to end behind the standard shell; - an interface plate connecting the side metal sheet to the rear of the standard shell perpendicular to the base metal sheet, said interface plate being a fastening means for a bustle rack; - upper metal sheets cooperating with the cannon support plates, the side metal sheets and the interface plate to close the standard shell; - two arches providing the junction between the front and rear of the standard shell, having a fixed height and forming a rectilinear channel extending from the cannon support plates to the interface plate, so that said arches define, inside the standard shell, three invariable zones from a functional and structural perspective, independently of the actual cannon module, i.e., a zone for hosting the gunner on the right, looking from the front of the vehicle, a zone for hosting the commander on the left, and a central zone intended to receive the primary weapon, the position of the arches defining fictive plans which, once extended downward with respect to the base metal sheet, make similarly appear the three aforementioned zones at the level of a basket optionally mounted on the standard shell; and - a cover, over the arches, the shape and/or height of which depending on the recoil created by the cannon module.