New distributional records of twenty species of Platygastrinae (Hymenoptera: Platygastridae) in Poland are given. Sixteen species are recorded for the first time: Amblyaspis scelionoides (HALIDAY), Anopedias lacustris (KIEFFER), Euxestonotus clavicornis BUHL, Leptacis fimbriata KIEFFER, Leptacis halia (WALKER), Leptacis ozines (WALKER), Platygaster cebes WALKER, Platygaster chloropus THOMSON, Platygaster doczkali BUHL, Platygaster euhemerus WALKER, Platygaster nisus WALKER, Platygaster sterope WALKER, Platygaster uniformis BUHL, Synopeas inerme THOMSON, Synopeas lugubre THOMSON, and Synopeas trebium (WALKER). Platygaster doczkali has been known so far only from the holotype collected in Germany. As this hymenopteran family is exceptionally poorly studied, and such a remarkable number of species new to the fauna of Poland was collected in only three geographic regions (Wielkopolsko-Kujawska Lowland, Lower Silesia and Bieszczady Mts), future surveys are expected to significantly extend the checklist of Polish platygastrids.