The Centre National de la Recherche Scientifique (National Center for Scientific Research) is a government-funded research organization, under the authority of France's Ministry of Research. Acting as a partner in Mont-Blanc, CNRS is involved at several levels of the project. Under the CNRS umbrella, 4 cross-faculty research units gather their expertise to address several key aspects of the project, such as the porting of exascale applications to the Mont-Blanc HPC system prototype: CORIA (COmplex of Interprofessional Research in Aerothermochemistry, CNRS / University of Rouen) will focus on the porting of the YALES2 solver, for the simulation of turbulent flows in complex geometries; LMA (Laboratory of Mechanics and Acoustics, CNRS) brings the SPECFEM3D solver that permits efficient simulation of seismic waves resulting from earthquakes or other acoustic or elastic sources. LIG (Grenoble Informatics Laboratory, CNRS / University Joseph Fourier) will bring its software expertise in parallel programming, performance analysis, runtimes and participate to the software development and porting of the aforementioned applications among others. LIRMM (Montpellier Laboratory of Informatics, Robotics, and Microelectronics, CNRS / University of Montpellier 2) will focus on explorations of the next-generation HPC platform, intended to achieve yet increased energy-efficiency and scalability, notably at the hardware-level through the specification of innovative compute accelerators and associated embedded software.