Society For The Diffusion Of Useful Knowledge (SDUK) was a British educational society, founded in London in 1826, whose maps rank among the most influential products of early Victorian popular publishing. Significant less for original surveying than for the careful compilation and wide circulation of reliable geographical knowledge, SDUK helped set a new standard for affordable, well-edited cartography aimed at a broad reading public.

The Society issued maps chiefly as accompaniments to its improving publications, most notably the Penny Magazine and the Library of Useful Knowledge, and in collected form as the SDUK Atlas. Production was typically collaborative: the Society oversaw editorial policy and text, while drawing and engraving were contracted to professional mapmakers and engravers, ensuring a consistent house style and a high level of finish.

SDUK maps are recognised for their clear typography, dense but orderly information, and an emphasis on contemporary political and statistical geography. Their success also illustrates the growing interdependence of education, print culture, and cartographic publishing in nineteenth-century Britain.

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