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[[File:2011-04-11 Minneplate Onsøy.jpg|thumb|World War II memorial at Onsøy]][[File:Elingaard front.jpg|thumb|Elingaard Manor]]
'''Onsøy''' is a peninsula and a former municipality in [[Østfold]] county, [[Norway]]. The administrative centre was [[Gressvik]].
The parish of ''Onsø'' was established as a municipality January 1, 1838 (see [[formannskapsdistrikt]]). A part of Onsøy with 170 inhabitants was moved to the neighboring municipality [[Fredrikstad]] on 1 January 1968.
On 1 January 1994 the rest of Onsøy was incorporated into Fredrikstad. Prior to the merger Onsøy had a population of 12.923.
The [[Old Norse]] form of the name was ''Óðinsøy''. The first element is the genitive case of the name of the god [[Odin]], the last element is ''øy'' f 'island'. The former island was later turned into a peninsula because of [[post-glacial rebound]].
Elingaard Manor (''Elingaard herregård'') is a [[manor house]] located on Onsøy. The current main building was erected in the Renaissance style and was completed early in 1749. The building was constructed on two floors and consists of a main wing and two side wings. Outside is a garden laid out by English model. The manor house was developed by Chancellor Jens Ågessøn Bjelke (1580–1659). Jens Bjelke, one of the wealthiest men in Norway, was the grandson of [[Jens Tillufssøn Bjelke]] and the father of [[Jørgen Bjelke]]. His elder son Admiral Henrik Bjelke (1615–83) inherited Elingaard Manor. Elingaard manor is currently operated as a museum.
*Borges, Grethe (2007) Elingaard : et gammelt herresete (Fredrikstad] : Fredrikstad museum) ISBN: 978-82-90301-21-2