Entoloma decastes is a species of mushroom in the family Entolomataceae.

The fungus fruits in dense clusters in sandy soil, in coastal grassland.

Fruitbodies have thin, dark brown caps measuring 1–5 cm (0.4–2.0 in) in diameter.

The thick gills are crowded close together, and initially greyish before turning pinkish brown.

This Agaricales-related article is a stub.