Belarus participated in the CMS experiment. The contribution to CMS through JINR via the construction of the absorber for the Endcap Calorimeter is particularly significant, and in 2003, the MZOR plant obtained the CMS Gold award for this work. The same factory also produced other equipment for ATLAS and CMS, while the Research Institute for Applied Physical Problems (Minsk) contributed to the quality control process of the CMS crystals.

Belarus joined the CLIC/CTF3 collaboration at the end of 2014.

An International Cooperation Agreement (ICA) was signed with Belarus in 1994.

At its Session in December 2023, the CERN Council decided to terminate the ICA between CERN and Belarus, together with all related protocols and addenda, with effect from 27 June 2024. At the same meeting, the CERN Council decided to terminate all other agreements and experiment Memoranda of Understanding allowing the participation of Belarus and its national institutes in the CERN scientific programme, with effect from 27 June 2024. Relations between CERN and institutions from Belarus ceased as of that date. The CERN Council’s resolutions concerning Belarus following the invasion of Ukraine can be found here.