| 2025 | 20 | Proceedings of the 20th International Workshop on Ontology Matching co-located with the 24th International Semantic Web Conference (ISWC 2025), Nara, Japan, November 2, 2025. | Nara | |
| 2024 | 19 | Proceedings of the 19th International Workshop on Ontology Matching co-located with the 23rd International Semantic Web Conference (ISWC 2024), Baltimore, USA, November 11, 2024. | Baltimore | |
| 2023 | 18 | Proceedings of the 18th International Workshop on Ontology Matching co-located with the 22nd International Semantic Web Conference (ISWC 2023), Athens, Greece, November 7, 2023. | Athens | |
| 2022 | 17 | Proceedings of the 17th International Workshop on Ontology Matching (OM 2022) co-located with the 21th International Semantic Web Conference (ISWC 2022), Hangzhou, China, held as a virtual conference, October 23, 2022. OM 2022 | Hangzhou | 2022-10-23 |
| 2021 | 16 | Proceedings of the 16th International Workshop on Ontology Matching co-located with the 20th International Semantic Web Conference (ISWC 2021), Virtual conference, October 25, 2021. OM 2021 | | 2021-10-25 |
| 2020 | 15 | Proceedings of the 15th International Workshop on Ontology Matching co-located with the 19th International Semantic Web Conference (ISWC 2020), Virtual conference (originally planned to be in Athens, Greece), November 2, 2020. OM 2020 | Greece | 2020-11-02 |
| 2019 | 14 | Proceedings of the 14th International Workshop on Ontology Matching co-located with the 18th International Semantic Web Conference (ISWC 2019), Auckland, New Zealand, October 26, 2019. OM 2019 | Auckland | 2019-10-26 |
| 2018 | 13 | Proceedings of the 13th International Workshop on Ontology Matching co-located with the 17th International Semantic Web Conference, OM@ISWC 2018, Monterey, CA, USA, October 8, 2018. OM 2018 | Monterey | 2018-10-08 |
| 2017 | 12 | Proceedings of the 12th International Workshop on Ontology Matching co-located with the 16th International Semantic Web Conference (ISWC 2017), Vienna, Austria, October 21, 2017. OM 2017 | Vienna | 2017-10-21 |
| 2016 | 11 | Proceedings of the 11th International Workshop on Ontology Matching co-located with the 15th International Semantic Web Conference (ISWC 2016), Kobe, Japan, October 18, 2016. OM 2016 | Kobe | 2016-10-18 |
| 2015 | 10 | Proceedings of the 10th International Workshop on Ontology Matching collocated with the 14th International Semantic Web Conference (ISWC 2015), Bethlehem, PA, USA, October 12, 2015. OM 2015 | Bethlehem | 2015-10-12 |
| 2014 | 9 | Proceedings of the 9th International Workshop on Ontology Matching collocated with the 13th International Semantic Web Conference (ISWC 2014), Riva del Garda, Trentino, Italy, October 20, 2014. OM-2014 | Riva del Garda | 2014-10-20 |
| 2013 | 8 | Proceedings of the 8th International Workshop on Ontology Matching co-located with the 12th International Semantic Web Conference (ISWC 2013), Sydney, Australia, October 21, 2013. OM-2013 | Sydney | 2013-10-21 |
| 2012 | 7 | Proceedings of the 7th International Workshop on Ontology Matching, Boston, MA, USA, November 11, 2012 OM-2012 | Boston | 2012-11-11 |
| 2011 | 6 | Proceedings of the 6th International Workshop on Ontology Matching, Bonn, Germany, October 24, 2011 OM-2011 | Bonn | 2011-10-24 |
| 2010 | 5 | Proceedings of the 5th International Workshop on Ontology Matching (OM-2010), Shanghai, China, November 7, 2010 OM-2010 | Shanghai | 2010-11-07 |
| 2009 | 4 | Proceedings of the 4th International Workshop on Ontology Matching (OM-2009) collocated with the 8th International Semantic Web Conference (ISWC-2009) Chantilly, USA, October 25, 2009 OM-2009 | Chantilly | 2009-10-25 |
| 2008 | 3 | Proceedings of the 3rd International Workshop on Ontology Matching (OM-2008) Collocated with the 7th International Semantic Web Conference (ISWC-2008), Karlsruhe, Germany, October 26, 2008 OM-2008 | Karlsruhe | 2008-10-26 |
| 2007 | 2 | Proceedings of the 2nd International Workshop on Ontology Matching (OM-2007) Collocated with the 6th International Semantic Web Conference (ISWC-2007) and the 2nd Asian Semantic Web Conference (ASWC-2007), Busan, Korea, November 11, 2007 OM-2007 | Busan | 2007-11-11 |
| 2006 | 1 | Proceedings of the 1st International Workshop on Ontology Matching (OM-2006) Collocated with the 5th International Semantic Web Conference (ISWC-2006), Athens, Georgia, USA, November 5, 2006 OM-2006 | Athens | 2006-11-05 |
