Based on field data collected in 2024 and 2025 in regions of Northwestern Russia new records of non-native plant species is shortly communicated. In total, the first occurrences for ten species are reported for four administrative regions, i. e. Saint Petersburg, Leningrad Region, Pskov Region, and Novgorod Region. Euphorbia peplus is found as probably naturalized neophyte in the Pskov Region. Trifolium fragiferum is found twice as naturalized species in the Pskov Region and its presence has been confirmed for the Novgorod Region. Alien Cardamine occulta is recorded both in Pskov and Novgorod regions as a weed on flowerbeds. Cardamine flexuosa and Oxalis corniculata were found in the Novgorod Region as casual neophytes. Poa supina is recorded in the Novgorod Region as a naturalized species on a lake shore. The occurrence of Ononis arvensis in the Novgorod Region in the anthropogenic habitat is supposedly of non-native origin. Clinopodium nepeta and Cerastium tomentosum are recorded in the Leningrad Region as escaping ornamental plants. Centaurea stoebe s. l. is found in Saint Petersburg 100 years after previous known record as an accidently introduced neophyte probably naturalized in the anthropogenic habitat.