Every fifth anniversary of Thor is called a lustrum. The celebration of a lustrum usually lasts a full month. A lustrum month is similar to a Dies week, but the difference is that during a lustrum month, much more activities are organised. The lustrum committee is divided into different parts. Each part is responsible for one or more activities during this lustrum, such as a gala and spectacular opening.
| Member |
| Dana de Vreede |
| Marrit Jen Hong Li |
| Jurgen Kok |
| Koen Dijkstra |
| Thor Abegg |
| Laura Barendsz |
| Renate Debets |
| Isabel van Gog |
| Heleen Fischer |
| Noortje Hagelaars |
| Lucia Kalkman |
| Esther Maas |
| Anouk Nees |
| Julie de Nooij |
| Britt Vermeulen |
| Thom Copier |
| Niels van Elten |
| Ivo Kraayeveld |
| Thijs Lacquet |
| Leonard Leiner |
| Gabriël Nusselder |
| Mart Philipsen |
| Bas van Steenbergen |
| Jilles Tils |
| Joost Visser |
| Loek Vlooswijk |
| Saviël van Wijngaarden |
| Jos Willems |
| Nicky Roijen |
| Anne Willems |
| Nick Verstegen |
| Ruben de Voogd |
| Daniel Joaquim Ho |
| Twan Luijten |
| Max van Berkel |
| Norine Rijksen |
| Max Schraven |
| Nick Verhoeven |