Woldemar Ludwig Grenser (2 January 1812, Dresden-Neustadt – 2 June 1872, Dresden) was a German obstetrician.
From 1830 he studied medicine at the University of Leipzig, obtaining his doctorate in 1838 with a dissertation titled De vi puerperii lactandique temporis medication trice.
In 1839 he took a scientific journey, visiting Prague, Vienna, Paris, London, Würzburg and Heidelberg.
Among his written works was an edition of Friedrich August von Ammon's Die ersten Mutterpflichten und die erste Kindespflege (1864), and with Hermann Franz Naegele (1801–1851), was co-author of Traité pratique de l'art des accouchements.
[3] Other noted works by Grenser include: In 1846 with Carl Friedrich Haase (1788-1865), he successfully treated future writer Karl May (1842-1912) for visual impairment.