Butyriboletus subappendiculatus is a pored mushroom in the family Boletaceae. It was originally described as a species of Boletus in 1979 before being reclassified in the genus Butyriboletus in 2014. The fungus produces medium-sized fruiting bodies with brownish-orange to buff-coloured caps up to 8 cm across, lemon-yellow tubes and pores that do not bruise blue when damaged, and yellowish stipes covered with a fine network pattern. It fruits in upper-montane coniferous or mixed forests across Europe and into Turkey, primarily under Norway spruce or silver fir on neutral to calcareous soils at elevations of 1,200–1,700 metres.

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