Bundesautobahn 21

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A 21
Bundesautobahn 21
Route information
Length	50 km (31 mi)
Location
Country	Germany
States	Schleswig-Holstein, Lower Saxony (planned)
Highway system
Roads in Germany Autobahns List Federal List State E-roads
← 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.