European route E40

E40
E40
	E40 interchange near Bruges, Belgium
Route information
Length	8,641 km (5,369 mi)
Major junctions
West end	E15 in Calais, France
	E25 in Liège, Belgium; E35 in Cologne, Germany; E45 in Kirchheim, Germany; E55 in Dresden, Germany; E65 in Legnica, Poland; E75 in Mysłowice, Poland; E85 in Dubno, Ukraine; E95 in Kyiv, Ukraine; E50 in Debaltseve, Ukraine;
East end	Ridder, Kazakhstan
Location
Countries	France, Belgium, Germany, Poland, Ukraine, Russia, Kazakhstan, Uzbekistan, Turkmenistan, Kyrgyzstan
Highway system
	International E-road network; A Class; B Class;

European route E40 is the longest European route, more than 8,000 kilometres (4,971 miles) long, connecting Calais in France via Belgium, Germany, Poland, Ukraine, Russia, Kazakhstan, Uzbekistan, Turkmenistan, and Kyrgyzstan, with Ridder in Kazakhstan near the border with Russia and China.

A different route, connecting Calais and Ridder, is about 2,000 kilometres (1,243 miles) shorter, mostly using the E30 via Berlin-Moscow-Omsk. The E40 differs from that route in order to provide additional direct east–west access to Uzbekistan, Turkmenistan, and Kyrgyzstan, with a combined population base approaching 50 million people as of 2021.

Since 2014, parts of the road in eastern Ukraine have been under the control of the separatist Donetsk People's Republic and Luhansk People's Republic. During the Russian invasion of Ukraine, Russia took direct control of the areas in Donbas.