Øystein Kvaal Østerbø is a Norwegian orienteering and ski-orienteering competitor. He finished overall third in the Orienteering World Cup in 2004, and won a silver medal in the relay in the 2004 World Ski Orienteering Championships. He has competed in all fifteen World Orienteering Championships since his debut in 2004 until 2018, obtaining his first two medals in Inverness in 2015; in the relay and mixed sprint relay, respectively. His best individual achievements are fourth places in the sprint in 2005 and 2010.

The Orienteering World Cup is a series of orienteering competitions organized annually by the International Orienteering Federation. Two unofficial cups were organized in 1983 and 1984. The official World Cup was held first in 1986, and then every second year up to 2004. From 2004 the World Cup has been held annually.