The M4 highway (Romanian: Drumul național M4) is a road in Transnistria, Moldova.

It runs from the south to the north, being 178 km (111 mi) long, and links the Transnistrian capital of Tiraspol with Rîbnița via Dubăsari, reaching the border with Ukraine at Hristovaia,[1] where it merges with the Ukrainian local road T0225.

[3] Heading north, it reaches the junction with the M5 highway, which runs between the border with Ukraine (east, towards the port city of Odesa) and Chișinău in the west.

[4] The road then crosses around the area of Grigoriopol before reaching the M1 highway south of the city of Dubăsari.

The road then reaches the border with Ukraine at Hristovaia, continuing as T0225 on the Ukrainian side.