Kupljensko (Serbian Cyrillic: Купљенско) is a village in central Croatia, in the municipality of Vojnić, Karlovac County.

According to the 2011 census,[4] the village of Kupljensko has 317 inhabitants.

This represents 61.20% of its pre-war population according to the 1991 census.

The 1991 census[5] recorded that 97.68% of the village population were ethnic Serbs (506/518), 0.77% were Yugoslavs (4/518), 0.39% were Croats (2/518) and 1.16% were Bosniaks (6/518).

This Karlovac County geography article is a stub.