A21

A21 is the abbreviation for:

• A bus - type of manufacturer MAN, see MAN Lion's City
• Highway 21 in Belgium
• The federal highway 21 in Germany
• The A21 road in the UK
• The Autostrada A21 in Italy
• The Vienna outer ring highway in Austria
• Autoestrada the A21 in Portugal
• Highway 21 in Switzerland
• The A21 in Kazakhstan

• Disambiguation
• Abbreviation