European route E 90 is an A-Class West–East European route, extending from Lisbon in Portugal in the west to the Turkish–Iraqi border in the east. It is connected to the M5 of the Arab Mashreq International Road Network.

The international E-road network is a numbering system for roads in Europe developed by the United Nations Economic Commission for Europe (UNECE). The network is numbered from E1 up and its roads cross national borders. It also reaches Central Asian countries like Kyrgyzstan, since they are members of the UNECE.