Two species of pteromalid wasps are recorded from Poland for the first time: Mesopolobus pseudofuscipes ROSEN, reared from galls of Rabdophaga salicis (SCHRANK) (Diptera: Cecidomyiidae) on willow, collected in the Wielkopolsko-Kujawska Lowland, and Mesopolobus xanthocerus (THOMSON), reared from a gall of Biorhiza pallida (OLIVIER) (Hymenoptera: Cynipidae) on oak, taken in Lower Silesia.