The Saab Catherina is a 1964 prototype automobile, commissioned by the Swedish automaker Saab, designed by Sixten Sason and made at the workshops of the Aktiebolaget Svenska Järnvägsverkstäderna (ASJ - the Swedish Railroad Works) in Katrineholm, Sweden (hence the name).
A second prototype was designed by Sixten Sason and delivered a month later by ASJ (Aktiebolaget Svenska Järnvägsverkstäderna - the Swedish Railroad Works) in Arlöv.