This paper presents the first report of the green cellar slug Limacus maculatus (Kaleniczenko, 1851) from the Netherlands. Suspicions were raised after pictures of several specimens were put on the online data platform Waarneming.nl in November 2020 under the name of L. fl avus (Linnaeus, 1758), a similar species already known from the Netherlands. Further investigation of external and internal components revealed that the specimens indeed belong to L. maculatus. This article describes this first discovery of L. maculatus in the Netherlands and provides a thorough discussion of the anatomical characteristics.