The maritime boundary between Sweden and Russia (formerly the Union of Soviet Socialist Republics) is a dual-purpose exclusive economic zone and continental shelf boundary in the Baltic Sea. Originally spanning 189 nautical miles, after the fall of the USSR, the boundary has since been reduced to only 4.5 nautical miles between the opposing coasts of Russia’s Kaliningrad exclave and Sweden. The original 1988 Sweden–USSR boundary is now divided between the Sates of Latvia, Lithuania and Estonia, which all gained independence after the fall of the USSR.

The modern-day boundary between Kaliningrad and Sweden connects the tripoint with Poland in the southwest to the tripoint with Lithuania in the northeast.