Zasavica I (), also known as Zasavica () or Gornja Zasavica (), is a village in the Sremska Mitrovica municipality, in Serbian province of Vojvodina. The village has a Serb ethnic majority and its population numbering 772 people (2011 census).
The village is located 12 km south-west of Sremska Mitrovica, on the river Zasavica. Although part of the Srem District, Zasavica I is situated in the region of MaÃÂva south of the Sava river. It is one of several settlements in the northern section of the region of MaÃÂva which were administratively included into the province of Vojvodina when it was created in 1945. With the adjacent village of Zasavica II (Donja Zasavica), it still forms a single cadastral unit, although they are treated as separate villages for census purposes.