| Otto Sydow | |
| Birth Date: | 1 February 1896 |
| Birth Place: | Rosemarsow, district of Demmin |
| Death Place: | Diepholz |
| Allegiance: | (to 1918) (to 1920) |
| Branch: | Prussian Army (1914–18) Reichsheer (1918–20) Luftwaffe (1935–45) |
| Serviceyears: | 1914–20 1935–45 |
| Rank: | Generalmajor |
| Commands: | 20th Flak Division 1st Flak Division |
| Battles: | World War I----World War II |
| Awards: | Knight's Cross of the Iron Cross |
| Laterwork: | Police officer |
Otto Sydow (1 February 1896 – 24 June 1970) was a highly decorated Generalmajor in the Luftwaffe during World War II. He was also a recipient of the Knight's Cross of the Iron Cross.
Otto Sydow was captured by Soviet troops in May 1945 and was held until October 1955.
. Walther-Peer Fellgiebel . 2000 . 1986 . Die Träger des Ritterkreuzes des Eisernen Kreuzes 1939–1945 — Die Inhaber der höchsten Auszeichnung des Zweiten Weltkrieges aller Wehrmachtteile . The Bearers of the Knight's Cross of the Iron Cross 1939–1945 — The Owners of the Highest Award of the Second World War of all Wehrmacht Branches . German . Friedberg, Germany . Podzun-Pallas . 978-3-7909-0284-6.