The Bundesstraße 45 is a German federal highway. It branches off the Bundesstraße 3 in Wöllstadt and leads south, goes through the city of Hanau, traverses the Odenwald and ends in Sinsheim.

B 45 shield}}
B 45
Bundesstraße 45
Route information
Length156 km (97 mi)
Major junctions
North endWöllstadt
South endSinsheim
Location
CountryGermany
StatesHesse, Baden-Württemberg
Highway system
  • Roads in Germany

The strip between Hanau and Dieburg was originally built and labeled as the Bundesautobahn 683, while the Bundesstraße 45 went through the cities. The A 683 was later downgraded and made part of the Bundesstraße 45.