The A621 motorway, formerly signed as the A642 motorway until 2024, is a short motorway in the Athens metropolitan area, Greece. It forms a connection between the A6 motorway (Attiki Odos) to the north, and the A62 motorway (Hymettus Peripheral Road, formerly signed as the A64 motorway) to the east. Its length is 2 km.
On 4 December 2015, the Greek government proposed to renumber the A642 as the A621: In practice, the renumbering had not taken place until 2024, because road signs were still showing the motorway as the A642. As of July 2024, the renumbering is being implemented due to road sign maintenance.
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