Suillus subacerbus is a species of bolete fungus in the family Suillaceae.

Described as new to science in 1968 by mycologist Robert Francis Ross McNabb, it is found in New Zealand, where it grows in association with Pinus radiata.

Its fruitbodies produce convex to flattened caps measuring 7–14 cm (2.8–5.5 in) in diameter.

The cap colour is quite variable, ranging from creamy yellow to olive grey initially, later becoming ochre, brown, or reddish orange (sometimes streaked) as the fruitbody matures.

[1] The complex of species that include Suillus granulatus, S. pungens, and S. acerbus appear to be closely related.