Sagiolechiaceae is a small family of lichen-forming fungi in the order Ostropales. It contains two genera, Rhexophiale, and Sagiolechia, the type genus.

Some Sagiolechiaceae species form crustose lichens with Trentepohlia-like photobiont partners (a genus of green algae); other do not form a thallus and are lichenicolous (i.e., they grow on other lichens). Asci are eight-spored with colourless ascospores that have transverse septa or are muriform (i.e. divided into chambers by both transverse and longitudinal septa). The genera Sagiolechia and Rhexophiale mainly differ from each other in how their fruiting bodies develop.

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