Tremerje (pronounced [ˈtɾeːmɛɾjɛ]) is a settlement in the City Municipality of Celje in eastern Slovenia.

It lies on the right bank of the Savinja River on the southwestern outskirts of Celje.

It is now included with the rest of the municipality in the Savinja Statistical Region.

[3] Tremerje is the site of a mass grave associated with the Second World War.

The Savinja Mass Grave (Slovene: Grobišče ob Savinji) lies along an unpaved road along the Savinja River, on an overgrown part of the riverbank near a fork in the road by an embankment.