De Proefbrouwerij is a Flemish brewery founded in 1996 by Dirk Naudts and his wife Saskia Waerniers. The brewery is located in the village of Lochristi, near Ghent. They operate as a rental brewery, creating beers for third party brewers, as well as producing their own beers. They also operate a research and development department focused on the science of brewing.
The brewery releases its own brand of beers under the moniker "Reinaert", these include: a flemish red ale (9%), an amber beer (7%), a tripel (9%), and a grand cru (9.5%).
The brewery operates predominantly as a rental brewery, and provide the brewing facilities to many gypsy breweries who do not have their own facilities, or who want to produce experimental small batch beers.