Bundesautobahn 21

A 21 shield}}
A 21
Bundesautobahn 21
Map
Route information
Length50 km (31 mi)
Location
CountryGermany
StatesSchleswig-Holstein, Lower Saxony (planned)
Highway system
  • Roads in Germany
A 20 A 23

Bundesautobahn 21 (translates from German as Federal Motorway 21, short form Autobahn 21, abbreviated as BAB 21 or A 21) is an autobahn in Germany.

It runs from an interchange with the A 1 at Bargteheide to Wankendorf, halfway between Bad Segeberg and Kiel. A northbound extension to Kiel and a southbound extension connecting to the A 39 are being planned. The A 21 will cross the extension of the A 20 near Bad Segeberg.