Koeleria is a common and widespread genus of plants in the grass family, found on all continents except Antarctica and on various oceanic islands. It includes species known generally as Junegrasses.

The genus was named after German botanist Georg Ludwig Koeler (1765–1807).

hundreds of species once included in Koeleria but now considered better suited to other genera including Aeluropus, Agrostis, Colpodium, Dactylis, Erioneuron, Festuca, Graphephorum, Rostraria, Schismus, Sesleria, Trisetaria and Trisetum.