| 2025 | 23 | Approximation and Online Algorithms - 23rd International Workshop, WAOA 2025, Warsaw, Poland, September 18-19, 2025, Proceedings | Warsaw | |
| 2024 | 22 | Approximation and Online Algorithms - 22nd International Workshop, WAOA 2024, Egham, UK, September 5-6, 2024, Proceedings | Egham | |
| 2023 | 21 | Approximation and Online Algorithms - 21st International Workshop, WAOA 2023, Amsterdam, The Netherlands, September 7-8, 2023, Proceedings | Kingdom of the Netherlands | |
| 2022 | 20 | Approximation and Online Algorithms - 20th International Workshop, WAOA 2022, Potsdam, Germany, September 8-9, 2022, Proceedings | Potsdam | |
| 2021 | 19 | Approximation and Online Algorithms - 19th International Workshop, WAOA 2021, Lisbon, Portugal, September 6-10, 2021, Revised Selected Papers | Lisbon | |
| 2020 | 18 | Approximation and Online Algorithms - 18th International Workshop, WAOA 2020, Virtual Event, September 9-10, 2020, Revised Selected Papers | | |
| 2019 | 17 | Approximation and Online Algorithms - 17th International Workshop, WAOA 2019, Munich, Germany, September 12-13, 2019, Revised Selected Papers | Munich | |
| 2018 | 16 | Approximation and Online Algorithms - 16th International Workshop, WAOA 2018, Helsinki, Finland, August 23-24, 2018, Revised Selected Papers WAOA | Helsinki | 2018-08-23/24 |
| 2017 | 15 | Approximation and Online Algorithms - 15th International Workshop, WAOA 2017, Vienna, Austria, September 7-8, 2017, Revised Selected Papers WAOA | Vienna | 2017-09-07/08 |
| 2016 | 14 | International Workshop on Approximation and Online Algorithms WAOA | Aarhus | 2016-08-24/25 |
| 2015 | 13 | International Workshop on Approximation and Online Algorithms WAOA | Patras | 2015-09-17/18 |
| 2014 | 12 | International Workshop on Approximation and Online Algorithms WAOA | Wrocław | 2014-09-11/12 |
| 2013 | 11 | International Workshop on Approximation and Online Algorithms WAOA | Sophia Antipolis | 2013-09-05/06 |
| 2012 | 10 | International Workshop on Approximation and Online Algorithms WAOA | Ljubljana | 2012-09-13/14 |
| 2011 | 9 | International Workshop on Approximation and Online Algorithms WAOA | Saarbrücken | 2011-09-08/09 |
| 2010 | 8 | Workshop on Approximation and Online Algorithms WAOA 2010, WAOA | Liverpool | 2010-09-09/10 |
| 2009 | 7 | Workshop on Approximation and Online Algorithms WAOA 2009, WAOA | Copenhagen | 2009-09-10/11 |
| 2008 | 6 | International Workshop on Approximation and Online Algorithms WAOA | Karlsruhe | 2008-09-18/19 |
| 2007 | 5 | International Workshop on Approximation and Online Algorithms WAOA | Eilat | 2007-10-11/12 |
| 2006 | 4 | International Workshop on Approximation and Online Algorithms WAOA | Zurich | 2006-09-14/15 |
| 2005 | 3 | International Workshop on Approximation and Online Algorithms WAOA | Palma | 2005-10-06/07 |
| 2004 | 2 | International Workshop on Approximation and Online Algorithms WAOA | Bergen | 2004-09-14/16 |
| 2003 | 1 | International Workshop on Approximation and Online Algorithms WAOA | Budapest | 2003-09-16/18 |