The Trematosphaeriaceae are a family of fungi in the order of Pleosporales. They are found world-wide with the greatest contributions found in Europe and Australia. It includes taxa that are found in the marine environment, such as Falciformispora lignatis which can be found in freshwater and marine habitats. Most are saprobic species (living on dead tissue).

Trematosphaeriaceae was introduced by Suetrong et al. (2011) to include the genera Falciformispora, Halomassarina and Trematosphaeria. The main distinguishing characters of the family are medium-sized rounded ascomata with a papillate ostiole (spore ejecting hole), a relatively wide, coriaceous peridium (protectivve layer), cellular pseudoparaphyses and cylindro-clavate asci. The ascospores are two-celled or many celled, hyaline (glass-like) or brown. Halomassarina was later moved to Pleomassariaceae order.

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