Butyriboletus roseoflavus is a pored mushroom in the genus Butyriboletus found in Asia. It was originally described in 2013 as a species of Boletus, but was transferred the following year to the newly created genus Butyriboletus.
It is known as xiaomei niuganjun () or huamei niuganjun () in Yunnan and huandian niuganjun () in Zhejiang. It was formerly misidentified as Boletus speciosus and Boletus appendiculatus.
A mushroom identified as xiaomei niuganjun is implicated in a 2014 poisoning leading to lilliputian hallucinations.