This Chapter summarizes the recent impact that the use of N-heterocyclic carbene (NHC) ligands in the field of Ni- and Pt-mediated processes.This family of ligands have allowed for the development of novel nickel-based catalysts of increased reactivity and selectivity compared to previous Ni-phosphine reagents. These NHCâ Ni reagents are active in hydrogenation, hydrogen transfer properties and Câ S or Câ F bond activation. Conversely, they efficiently catalyze arythiolation, hydrothiolation and cross-coupling reactions as well as different cross-couplings, cycloadditions of alkynes or isomerization of vinylcyclopropanes.On the other hand, NHCâ Pt analogues have been less studied for catalytic applications. Regioselective and/or asymmetric hydroboration as well as hydrosilylation constitute the two most areas of research for these species.