RB 53 is the designation of several regional rail services in Germany:
, operated by Bayerische Regiobahn between Traunstein and Ruhpolding , operated by DB Regio Baden-Württemberg between Albstadt-Ebingen and Aulendorf , operated by DB Regio Bayern between Schlüchtern and Bamberg , operated by DB Regio Mitte between Neustadt and Wissembourg , operated by DB Regio NRW between Dortmund and Iserlohn , operated by DB Regio Südost between Bad Langensalza and Gotha
As well as the Swedish Bantam (missile) anti-tank guided missile with the designation Rb 53.