OLG

The acronym OLG may refer to:


 * Oberlandesgericht, a higher regional court of appeals in Germany
 * Online gaming
 * Ontario Lottery and Gaming Corporation, a Canadian provincial government agency which operates lottery games and casinos.
 * Our Lady of Guadalupe
 * Overlapping gene in genomes
 * Overlapping generations in population genetics
 * Overlapping generations model in economics