Jean-Henri-Guillaume Krombach, also known as Johann Heinrich Wilhelm Krombach (16 September 1791 in Moers – 23 February 1881 in Luxembourg City) was a German-Luxembourgian pharmacist and botanist.

He initially worked as an assistant pharmacist in a number of German cities (Soest, Mainz and Aachen), then in 1815 relocated as a pharmacist to Diekirch, Luxembourg.[1] From 1850 he served as a pharmacist in the nearby town of Ettelbruck.[2]

Beginning in 1830 he taught classes in natural sciences at schools in Diekirch and Ettelbruck.[1][2] In 1871 he was named president of the Société de botanique du Grand-Duché de Luxembourg.[3]

In 1875, he published "Flore du grand-duché de Luxembourg. Plantes phanérogames" (Flora of the Grand Duchy of Luxembourg; phanerogams).[4] He is the taxonomic authority of the subtribe Olyrinae (family Poaceae).[5]

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