The first findings ofCyperus microiria, an alien species with a natural range in South and Southeast Asia, are reported for the Caucasus. The species was initially discovered in collections from Adjara stored in the Herbarium of the Batumi Botanical Garden (BATU), and then was re-collected by the author from the same region in 2023. The first collections from the territory of the Botanical Garden, where the species entered presumably due to the introduction of subtropical Asian plants, date back to 1987. Currently, it is a fairly common species in disturbed wet habitats of the coastal lowland. The nearest findings were made in Rize, Turkey, where the species was recorded as naturalized only in 2014.