RB 23 is the designation of several regional rail services in Germany:
- RB 23, operated by DB Regio Mitte between Mayen Ost and Limburg (Lahn)
- RB 23, operated by DB Regio Nordost between BER Airport – Terminal 1-2 and Golm
- RB 23, operated by DB Regio Nordost between Züssow and Świnoujście Centrum
- RB 23, operated by DB Regio NRW between Bad Münstereifel and Euskirchen
- RB 23, operated by Oberpfalzbahn between Regensburg and Marktredwitz or Neustadt (Waldnaab)
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