Koser may refer to:
Anja Koser (born 1970), German handball and football player Fatma Koşer Kaya (born 1968), Dutch lawyer and politician of Turkish origin Ralf Koser (born 1973), German judoka several Yugoslavian sailplanes designed by Jaroslav Koser: Koser-Hrovat KB-1 Triglav Koser KB-3 Jadran Koserbach (other name Koser), a river of Bavaria, Germany, tributary of the Schorgast Großer Koserbach, uppercourse name of the Koserbach Kleiner Koserbach, tributary of the Koserbach