A cartridge (11) for a typewriter typing ribbon (18) comprises a container (17) for accommodating the typing ribbon (18) which can be of correctable or non-correctable type. A corrector cartridge (12) can be removably fixed on the lower part of the container (17) by engagement means (31). The corrector cartridge (12) accommodates a correction ribbon (27) which can be of the lift-off type suitable for the typing ribbon of correctable type, or of the cover-up correction type which is suitable for the typing ribbon of non-correctable type. Coupling means (32) on the cartridge (11) and the corrector cartridge (12) permit the engagement means (31) removably to fix the corrector cartridge (12) to the container (17) only when the cartridge (11) houses the typing ribbon of correctable type and the corrector cartridge (12) houses the correction ribbon of lift-off type or alternatively when the typing ribbon is of non-correctable type and the correction ribbon is of the cover-up type. In the event of a different choice, the coupling means (32) prevent the engagement means (31) from operating when the ribbons are not compatible with each other. Fixing means (88, 92) removably fix the container (17) to a support of the typewriter either by itself or with the corrector cartridge (12) attached and the fixing means do not co-operate and interfere with the engagement means (31) and the coupling means (32).