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Wikipedia has various contests from time to time -- for good writing, site and logo designs, or great images or media -- to encourage and recognize brilliant, unusual, or specially-targeted contributions.
Contests have also been run on various other Wikimedia projects, generally eliciting excitement and support; the Wikinews writing contest in March/April and the second German writing contest (part of the International writing contest) both attracted over 10 unusual prizes from the community to hand out to the lucky/skillful winners.
|International writing contest||-||Closed||ca March 2005||A coordinated contest across a number of Wikipedias.||winners | on meta|
|Deshipidian 2008||-||Closed||ca 2008||arranged by WikiProject:Bangladesh|
|WikiCup||2016||Closed||1 Jan - 31 Oct 2016||Results|
|WikiCup||2017||Closed||1 Jan - 31 Oct 2017||Results|
|WikiCup||2018||Closed||1 Jan - 31 Oct 2018||Results|
|WikiCup||2019||Closed||1 Jan - 31 Oct 2019||Results|
|WikiCup||2020||Closed||1 Jan - 31 Oct 2020||Results|
|WikiCup||2021||Closed||1 Jan - 31 Oct 2021||Results|
|Bacon WikiCup||2010||Closed||Adding bacon-related content||Winners|
|Bacon WikiCup||2011||Closed||Adding bacon-related content||Winners|
|Bacon WikiCup||2012||Closed||Adding bacon-related content||Winners|
|Awaken the Dragon||2016||Closed||1 Apr - 2 May 2016||Contest run by WikiProject Wales|
|The West Country Challenge||2016||Closed||8 Aug - 4 Sep 2016||A contest/editathon aimed at improving the quality and quantity of coverage of Bristol, Somerset, Devon, Cornwall and the Isles of Scilly, Dorset, Wiltshire and Gloucestershire|
|The Great Britain and Ireland Destubathon||2020||Closed||March 2020|
|Wiki Loves Women #15Challenge Writing Contest||2016||Closed||15 Jan 2016 - 31 Jan 2016||15 days to create (at least) 15 biographies on notable African women|
|Wiki Loves Women #16WikiWomen Translation Drive||2017||Closed||20 Feb 2017 - 6 March 2017||16 days to make available biographies on 16 notable African women, in at least 16 languages|
|Wiki Loves Women #17African feminists||2017||Closed||01 Nov 2017 - 30 Nov 2017||Biographies about African feminists|
|Military history Contest||Ongoing||Rolling competition each month that awards points for improving articles|
|WikiGrail||2012||Closed||Competition run by WikiProject Christianity|
|Stub Contest||2019||Closed||1 Oct 2019 - 31 Dec 2019||Women in Red biographies|
|Wikimania 2005:Writing contest||2005||Closed|
|Danny's contest||2004||Closed||Oct 2004|
|Danny's contest||2004||Closed||Nov 2004|
|The Core Contest||2007||Closed||25 Nov - 9 Dec 2007||Improving Wikipedia's most important articles|
|The Core Contest||Mar 2012||Closed||10 Mar - 31 Mar 2012||Improving Wikipedia's most important articles|
|The Core Contest||Aug 2012||Closed||Aug 2012||Improving Wikipedia's most important articles|
|The Core Contest||2013||Closed||Apr 2013||Improving Wikipedia's most important articles|
|The Core Contest||2014||Closed||10 Feb - 9 Mar 2014||Improving Wikipedia's most important articles|
|The Core Contest||2015||Closed||1 Mar - 14 Apr 2015||Improving Wikipedia's most important articles|
|The Core Contest||2016||Closed||15 May - 30 Jun 2016||Improving Wikipedia's most important articles|
|The Core Contest||2017||Closed||May - Jun 2017||Improving Wikipedia's most important articles|
|The Core Contest||2021||Closed||1 Jun - 15 Jul 2021||Improving Wikipedia's most important articles|
|9th ISCB Wikipedia Competition||9th||Closed||26 Aug 2019 - 15 May 2020||Improving content relating to computational biology or bioinformatics|
|10th ISCB Wikipedia Competition||10th||Closed||1 Sep 2020 - 14 May 2021||Improving content relating to computational biology or bioinformatics|
|Women in Asia contest||2020||Closed||1 Oct - 31 Dec 2020||Women in Red: New biographies of Asian women|
|11th ISCB Wikipedia Competition||11th||On going||1 Sep 2021 - 29 Apr 2022||Improving content relating to computational biology or bioinformatics|
|Women in Red translation contest||2022||Active||1 Apr - 30 June 2022||Women in Red: translation of women's biographies from other versions of Wikipedia|
|CEE Spring||2022||Future||15 April - 31 May||Central en Eastern Europe (in broader sense), subtopic: language Esperanto, related to human rights|
- Wikimania competition
- An extended media contest, combining a contest for media gathered while at or en route to Wikimania, with a general contest for all content produced this year.
- Wikipedia:US Banknote Contest/2019
- A contest focused on images of Unites States banknotes
- commons:Category:Photography competitions
- Wikipedia:The Great Wikipedia Dramaout, for 5 days, starting July 18, 2009, Wikipedians are being asked to voluntarily refrain from editing all non-article areas of Wikipedia, and instead dedicate themselves to creating, cleaning up, and building articles.
- Wikipedia:The Great Backlog Drive
The Wikimedia Foundation (WMF) advises  that although there is no problem in general with third parties running contests on Wikipedia, contest organizers should note the following:
- The contest should not be presented as if it was being organized, sponsored or endorsed by the WMF. This includes using the Wikipedia/WMF logos, which are trademarked and may only be used with the permission of the WMF (see Wikipedia:Copyrights), or implying that the WMF has any involvement beyond hosting the platform being used. (If you are unsure about your contest in this regard, please contact liaisonwikimedia.org.)
- Contributors are liable for their own contributions, which include the people running such contests.
- Organizers may wish to obtain advice on contest law before attempting to run a contest, on-wiki or elsewhere.
- Organizers can save time by copying this Wikipedia:Contests/Toolkit/Template model to set up a contest, based on a successful contest which produced nearly 3000 articles in one month.
- m:Learning and Evaluation/Evaluation reports/2013/On-wiki writing contests - an attempt to evaluate the impact of contests
- Wikipedia:Reward board