Otto Sendtner (June 27, 1813 – April 21, 1859) was a German botanist and phytogeographer born in Munich.He received his education at the University of Munich, where he was a student of Karl Friedrich Schimper (1803-1867). Afterwards he served as a private secretary to a Silesian nobleman, and during his spare time performed studies of cryptogramic flora of the Sudetenland.In 1841 he was appointed curator of the Leuchtenbergsche Naturalienkabinett in Eichstätt.