CERN welcomes physicists (users) from various institutes around the world, including Belgium.
There are also Belgian physicists participating to CERN experiments through institutes from other countries.

Key numbers about the Belgian participation to CERN research programmes (end of 2019)

Number of data taking experiments with Belgian Institutes participation 15
Participating Belgian institutes 9
Users through Belgian Institutes 147
Users of Belgian nationality 114

Data taking experiments in which Belgian institutes take part

Experiments Participating Belgian Institutes
CMS Ghent University
KU Leuven
Université catholique de Louvain (UCL)
Université Libre de Bruxelles (ULB)
Université de Mons
Universiteit Antwerpen
Vrije Universiteit Brussel (VUB)
ISOLDE Facility
(mutiple experiments)
Ghent University
KU Leuven
Belgian Nuclear Research Center (SCK-CEN)
Université Libre de Bruxelles (ULB)
nTOF Collaboration Joint Research Center (JRC) (IRMM)
NA62 Université catholique de Louvain (UCL)

Sources: CERN Greybook for experiments and institutes and CERN HR report for users
Access up-to-date information about the Belgian institutes which participated or are participating to CERN research programmes in the Greybook.

CERN Belgian Institutes