Clitopilopsis hirneola is a small agaric fungus in the family Entolomataceae found in temperate European woodland and grassland habitats. The genus Clitopilopsis is closely related to Clitopilus and shares morphological features including pinkish-tinged gills at maturity reflecting the production of pink angular spores characteristic of the family Entolomataceae. It fruits in autumn, typically in short grasslands, woodland margins, and heathland habitats where soil conditions favor this species. The cap is typically small, convex to depressed, pale to whitish or greyish, with crowded, slightly decurrent gills. The species name hirneola may reference a small jar or bowl shape describing the mature cap form. Like related species, C. hirneola contributes to the decomposer community in its habitats, breaking down plant litter and organic matter. European entolomatoid fungi form a diverse and taxonomically complex group, with many species recorded from traditional, unfertilized grasslands and old woodland habitats that have declined significantly across Europe due to agricultural intensification.