Betulaceae, las Betuláceas, son una familia del orden Fagales. Está compuesta por árboles o arbustos dicotiledóneos caducifolios y monoicos que se encuentran en regiones templadas y zonas de montaña en los trópicos. A ella pertenecen los alisos y los abedules. En el pasado, esta familia estaba dividida en dos, Betulaceae (Alnus y Betula) y Corylaceae (el resto); sin embargo, estudios recientes en el Angiosperms Phylogeny Group, han llevado a incluir la antigua familia Corylaceae dentro de las Betulaceae.

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The birch family, the Betulaceae, includes six genera of deciduous nut-bearing trees and shrubs, including the birches, alders, hazels, hornbeams, hazel-hornbeam, and hop-hornbeams numbering a total of 167 species. They are mostly natives of the temperate Northern Hemisphere, with a few species reaching the Southern Hemisphere in the Andes in South America. Their typical flowers are catkins and often appear before leaves. In the past, the family was often divided into two families, Betulaceae (Alnus, Betula) and Corylaceae (the rest). Recent treatments, including the Angiosperm Phylogeny Group, have described these two groups as subfamilies within an expanded Betulaceae: Betuloideae and Coryloideae. Diagnostically, Betulaceae is very similar to Rosaceae and other rose motif families.

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