Leopold Loeske (24 October 1865, Hohensalza – 29 March 1935, Bad Harzburg) was a German watchmaker and amateur bryologist.
A skilled watchmaker, he was self-taught as a bryologist, collecting moss specimens in Germany, Switzerland and the French Alps during his career.
Following World War I, he spent eight years working as a correspondent for a commercial institution due to financial struggles.
He died at Bad Harzburg while on a collection excursion in the Harz Mountains.The moss genera Loeskeobryum (M.Fleisch.
ex Broth.
1925) and Loeskypnum (H.K.G.Paul, 1916) are named in his honor.