Process for producing tyres for vehicle wheels, comprising: - building a green tyre comprising a carcass structure , a tread band arranged in a radially outer position with respect to the carcass structure and a pair of sidewalls associated with the carcass structure on opposite sides with respect to an equatorial plane (M-M) of the green tyre; - providing a vulcanization mold comprising a first half-shell , a second half-shell opposite said first half-shell and a crown of circumferential sectors configured to air-tightly couple with said first half-shell and second half-shell when said vulcanization mold is closed; - arranging at least one label comprising a layer of colored cross-linkable elastomeric material in a predetermined position on a first support surface defined in at least one of said first half-shell and second half-shell , said first support surface having a predetermined first surface profile; - holding in position said at least one label on said first support surface ; - arranging said green tyre inside said vulcanization mold so that one of the sidewalls of the green tyre rests on said first support surface ; - closing said vulcanization mold ; - co-vulcanizing said green tyre and said at least one label inside said vulcanization mold , wherein at least one initial part of said co-vulcanization is carried out while said at least one label is held in position on said first support surface ; wherein arranging said at least one label on said first support surface comprises: - arranging said at least one label on a second support surface defined in a label transfer member and having a second surface profile with a shape matching the shape of said first surface profile; - transferring said at least one label from said second support surface to said first support surface . - building a green tyre comprising a carcass structure , a tread band arranged in a radially outer position with respect to the carcass structure and a pair of sidewalls associated with the carcass structure on opposite sides with respect to an equatorial plane (M-M) of the green tyre; - providing a vulcanization mold comprising a first half-shell , a second half-shell opposite said first half-shell and a crown of circumferential sectors configured to air-tightly couple with said first half-shell and second half-shell when said vulcanization mold is closed; - arranging at least one label comprising a layer of colored cross-linkable elastomeric material in a predetermined position on a first support surface defined in at least one of said first half-shell and second half-shell , said first support surface having a predetermined first surface profile; - holding in position said at least one label on said first support surface ; - arranging said green tyre inside said vulcanization mold so that one of the sidewalls of the green tyre rests on said first support surface ; - closing said vulcanization mold ; - co-vulcanizing said green tyre and said at least one label inside said vulcanization mold , wherein at least one initial part of said co-vulcanization is carried out while said at least one label is held in position on said first support surface ; - arranging said at least one label on a second support surface defined in a label transfer member and having a second surface profile with a shape matching the shape of said first surface profile; - transferring said at least one label from said second support surface to said first support surface . <EOS>