RB 68 is the designation of several regional rail services in Germany:
, operated by Bayerische Regiobahn between Füssen and Munich , operated by DB Regio Mitte between Frankfurt (Main) and Wiesloch-Walldorf , operated by DB Regio Mitte between Saarbrücken and Pirmasens , operated by SWEG Bahn Stuttgart between Hechingen and Sigmaringen