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| Route information | |
| Length | 651 km (405 mi) |
| Major junctions | |
| West end | Franzensfeste, Italy |
| East end | Székesfehérvár, Hungary |
| Location | |
| Countries |  Italy Austria Hungary |
| Highway system | |
European route E66 is a part of the International E-road network. This Class A intermediate west-east route runs 651 kilometres (405 mi) from Franzensfeste in Italy to Székesfehérvár in Hungary, connecting the Alps with the Pannonian Plain.