New audiovisual producs such as teletext, Internet, videogames or DVDs and the new techniques based on computers have increased new subtitling possibilities, as open and closed subtitles, which can be chosen by the spectator, or electronic subtitles, projected through luminous panels or subtitles for life theatre performances or opera productions. The rapid technological development in all areas has given rise to new types of subtitles which do not fit in the existing classifications of subtitles. In this article a comprehensive classification of subtitles is presented, taking into account previous studies by Luyken, Ivarsson, Gottlieb and Díaz Cintas. The author's intention is to establish new parameters which encompass the wide range of existing subitles in the subtitling industry. The aim of such a cliassification is a better description of all existing types of subtitles for scholars and translators.