A hackathon is an event in which computer programmers and others involved in software development and hardware development, including graphic designers, interface designers and project managers, collaborate intensively on software projects.
- Wikimedia Hackathon 2020 in Tirana, Albania. Postponed and gone virtual.
- Hackathon during Wikimania 2019 in Stockholm, Sweden
- Wikimedia Hackathon 2019 in Prague, Czech Republic
- Hackathon during Wikimania 2018 on the 18th - 22nd July 2018 in Cape Town, South Africa
- Wikimedia Hackathon 2018 in Barcelona, Spain
- OFF.NETWORK 14-18 Aug 2017, Potsdam, N.Y.
- Hackathon during Wikimania 2017 on August 9-13 in Montreal, Canada
- Wikimedia Hackathon 2017 on May 19-21 in Vienna, Austria
- Hackathon during Wikimania 2016 in Esino Lario, Italy
- Wikimedia Hackathon 2016 in Jerusalem, Israel
- Hackathon during Wikimania 2015 in Mexico-City
- Wikimedia Hackathon 2015 in Lyon, France
- Hackathon during Wikimania 2014 in London, United Kingdom
- Zürich Hackathon 2014 in Zürich, Switzerland
- Hackathon (DevCamp) during Wikimania 2013 in Hong Kong
- Amsterdam Hackathon 2013 in Amsterdam, Netherlands
- Hackathon during Wikimania 2012 in Washington, D.C.
- Berlin Hackathon 2012 in Berlin, Germany
- Amsterdam Hackathon 2012 in Amsterdam, Netherlands
- Hackathon (Developer Days) during Wikimania 2011 in Haifa, Israel
- Amsterdam Hackathon 2011 in Amsterdam, Netherlands
(Incomplete list, see mw:Category:MediaWiki developer meetings for more.)