European route E 77 is a part of the inter-European road system.

This Class A intermediate north–south route is 1,690 km (1,050 mi) long and it connects the Baltic Sea with the central part of the continent.

In the version of the E-road network established in 1975, E77 was a much shorter road in Hungary from Püspökladány, E60 to Nyíregyháza, which is now part of E573.

The section of current E77 between Gdańsk and Budapest was part of E75.

The north end of the road system is in Pskov Oblast in Russia, it passes through Estonia, Latvia, Lithuania, Poland, Slovakia, to the south end in Budapest, Hungary: Russia (Pskov Oblast) Estonia Latvia Lithuania Russia (Kaliningrad Oblast) : Kaliningrad - Gdańsk (as no ferry available from Baltiysk) Poland Slovakia Hungary A bypass to the east of Panemunė and Sovetsk, incorporating new border control points and a new bridge over the Neman River, is under construction.