RB 81 is the designation of several regional rail services in Germany:

• RB 81, operated by DB Regio Bayern between Steinach (b Rothenburg o. d. Tauber) and Neustadt (Aisch)
• RB 81, operated by DB Regio Mitte between Trier and Koblenz
• RB 81, operated by DB Regio Nord between Bodenfelde and Nordhausen
• RB 81, operated by DB Regio Nord between Hamburg and Bad Oldesloe
• RB 81, operated by Erzgebirgsbahn between Chemnitz and Olbernhau-Grünthal
• RB 81, operated by VIAS between Darmstadt and Eberbach

This disambiguation page lists articles associated with the title RB 81.
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