Ciboria rufofusca is a species of ascomycete fungus in the family Sclerotiniaceae. It was first described as a member of Peziza in 1873 and later transferred to the genus Ciboria in 1889. The fungus produces distinctive cup-shaped fruiting bodies that are brown to maroon on the inside, supported by dark brown to blackish stalks, and typically measure up to 15 mm in diameter. It grows exclusively on fallen cone scales of conifers, primarily silver fir (Abies alba) and occasionally other fir species, spruces, and Douglas fir. Though considered rare throughout most of Western Europe except in mountainous regions where silver fir is abundant, C. rufofusca can also be found in the Pacific Northwest region of North America.

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