A hair guide configured to be detachably couplable to a hair cutting apparatus, wherein the hair cutting apparatus comprises at least two cutting units (106, 108, 110) each having an external cutting member and an internal cutting member which is rotatable relative to the external cutting member about an axis of rotation (x), wherein the external cutting member has an annular cutting zone comprising hair-entry openings provided at least in a main annular wall of the cutting zone, said annular cutting zone further comprising an inner side wall which surrounds a central wall portion of the external cutting member, said central wall portion being recessed relative to the main annular wall at least in an annular recessed area adjacent to the inner side wall, said hair guide comprising: - a support member configured to be detachably couplable to the hair cutting apparatus, characterized in that said hair guide further comprises: - at least two annular hair guiding members (206, 208, 210) each having a central axis (y) and a plurality of hair guiding elements having a main direction of extension in a radial direction relative to the central axis and arranged in an annular hair guiding zone extending about the central axis, wherein: - the annular hair guiding members are arranged relative to the support member such that, when the support member is coupled to the hair cutting apparatus, each of the at least two annular hair guiding members is associated with a respective one of the at least two cutting units such that the plurality of hair guiding elements partially cover the main annular wall of the associated cutting unit, and - at least one of the hair guiding elements has an inwardly directed rounded end portion which is arranged at a distance from the central axis such that, when the support member is coupled to the hair cutting apparatus, the rounded end portion is positioned, in a radial direction relative to the central axis, at least partially inwardly of the inner side wall of the associated cutting unit and, in an axial direction relative to the central axis, at a distance from the annular recessed area of the associated cutting unit. - a support member configured to be detachably couplable to the hair cutting apparatus, - at least two annular hair guiding members (206, 208, 210) each having a central axis (y) and a plurality of hair guiding elements having a main direction of extension in a radial direction relative to the central axis and arranged in an annular hair guiding zone extending about the central axis, - the annular hair guiding members are arranged relative to the support member such that, when the support member is coupled to the hair cutting apparatus, each of the at least two annular hair guiding members is associated with a respective one of the at least two cutting units such that the plurality of hair guiding elements partially cover the main annular wall of the associated cutting unit, and - at least one of the hair guiding elements has an inwardly directed rounded end portion which is arranged at a distance from the central axis such that, when the support member is coupled to the hair cutting apparatus, the rounded end portion is positioned, in a radial direction relative to the central axis, at least partially inwardly of the inner side wall of the associated cutting unit and, in an axial direction relative to the central axis, at a distance from the annular recessed area of the associated cutting unit.