Butyriboletus fechtneri is a basidiomycete fungus in the family Boletaceae.

It was formerly regarded as a species of Boletus, but in 2014 was transferred to the newly erected genus Butyriboletus, after molecular data revealed that it is a member of the "Regius" clade (named after B. regius), quite distant from the core clade of B. edulis and closely allied species.

[1][2] Butyriboletus fechtneri is native to Europe, where it forms ectomycorrhizal associations with various broad-leaved trees of the family Fagaceae, particularly oak (Quercus), beech (Fagus) and chestnut (Castanea).

[3][4][5] So far it has been molecularly confirmed from Austria, Bulgaria, Cyprus, Estonia, France, Spain and Sweden.

[7] Recent molecular phylogenetic studies have shown regional populations of B. fechtneri to be highly variable genetically, suggesting they might be in the process of speciation.