|A.K.A.||Otto Franz von Moellendorff, Möllendorff, Moellendorff|
|Was||Zoologist Malacologist Scientist|
|Birth||24 December 1848, Hoyerswerda, Germany|
|Death||17 August 1903, Frankfurt am Main, Germany (aged 54 years)|
Otto Franz von Möllendorff (24 December 1848 – 17 August 1903) was a German scientist, a malacologist. In 1894, Jose Rizal sent (from Dapitan) to Möllendorff (who was in Manila at that time) specimens of large sea snails known as tun shells together with some specimens of a species of small freshwater snails stored in glass vials. The species of small snails was later named Oncomelania quadrasi by Möllendorff in 1895 in honour of Don José Florencio Quadras, a Spanish malacologist who was also based in Manila at that time.
A species of rat snake, Elaphe moellendorffi, is named in his honor.