Refillable assembly (100, 200, 300) for dispensing cosmetic product, in particular refillable lipstick, defining a longitudinal axis, the assembly comprising: - a base (12, 112, 212, 312), and - a cartridge (14, 114, 214, 314) selectively connectable with the base, the cartridge having an outer sheath (18, 118, 218, 318) and a control socket (22, 122, 222, 322) internal to the sheath and arranged in a lower portion of the cartridge, the control socket allowing the extraction of cosmetic product from the cartridge, the cartridge having an opening (130, 230, 330) in the control socket, the base comprising: - a cartridge receiving element (132, 232, 332), the receiving element having a sleeve (134, 234, 334) suitable for receiving within its interior the lower portion of the cartridge; and - a cartridge locking element (148, 248, 348), the locking element being movable relative to the receiving element at least in rotation about the longitudinal axis in a first direction towards an open position and in a second direction towards a closed position; in the open position the cartridge is movable relative to the base along the longitudinal axis, in the closed position when the cartridge is inserted into the base the cartridge is integral with the base along the longitudinal axis, a connection (150, 250, 350) between the locking element and the receiving element comprising a closure abutment (152, 252, 352) in the closed position such that when the locking element is in the closed position and the base is rotated in the second direction, the receiving element and the locking element are integral in rotation and the control socket of the cartridge is driven by a transmission element of the base that is engageable with the control socket of the cartridge. - a base (12, 112, 212, 312), and - a cartridge (14, 114, 214, 314) selectively connectable with the base, the cartridge having an outer sheath (18, 118, 218, 318) and a control socket (22, 122, 222, 322) internal to the sheath and arranged in a lower portion of the cartridge, the control socket allowing the extraction of cosmetic product from the cartridge, the cartridge having an opening (130, 230, 330) in the control socket, - a cartridge receiving element (132, 232, 332), the receiving element having a sleeve (134, 234, 334) suitable for receiving within its interior the lower portion of the cartridge; and - a cartridge locking element (148, 248, 348), the locking element being movable relative to the receiving element at least in rotation about the longitudinal axis in a first direction towards an open position and in a second direction towards a closed position; in the open position the cartridge is movable relative to the base along the longitudinal axis, in the closed position when the cartridge is inserted into the base the cartridge is integral with the base along the longitudinal axis, a connection (150, 250, 350) between the locking element and the receiving element comprising a closure abutment (152, 252, 352) in the closed position such that when the locking element is in the closed position and the base is rotated in the second direction, the receiving element and the locking element are integral in rotation and the control socket of the cartridge is driven by a transmission element of the base that is engageable with the control socket of the cartridge.