Muuga Harbour (Estonian: Muuga sadam) is the largest cargoport in Estonia, located on the southern coast of the Gulf of Finland, 13 km northeast of the capital Tallinn, in Maardu. The harbour is administrated by Port of Tallinn, the biggest port authority in Estonia. Muuga Harbour is one of the few ice-free ports in northernmost Europe and among the deepest (up to 18 m) and most modern ports in the Baltic Sea region. The cargo volume handled accounts for around 80% of the total cargo volume of Port of Tallinn and approximately 90% of the transit cargo volume passing through Estonia. Nearly 3/4 of cargo loaded in Muuga Harbour includes crude oil and oil products, but the harbour also serves dry bulk (mostly fertilizers, grain and coal) and other types of cargo.
The usual cargo traffic in the seaport is about 20–30 mil. tons.
The harbour covers an area of 5.24 km² land and 7.5 km² aquatory. Besides Maardu the seaport also occupies lands from the villages of Muuga and Uusküla.
There are 29 quays with the whole length of 6.4 km. The maximum depth is 18.0 m. The largest possible size of a ship is 300 ✕ 48 meters.
There are 6 liquid bulk terminals, container, grain, coal, steel and a dry bulk terminals located in the port.