The Suaedoideae are a subfamily of plants in the family Amaranthaceae (now including the former family Chenopodiaceae). These plants are characterized by well-developed leaves, which, except for the Bienertia genus, feature a central vascular bundle and numerous lateral bundles. Suaedoideae are found nearly worldwide and play a significant role in the vegetation of shorelines and salty inland habitats, particularly in arid regions. The subfamily includes both C3 and C4 plants, with C4 photosynthesis having originated independently four times within the group. Phylogenetic research divides Suaedoideae into two tribes: Bienertieae and Suaedeae.

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