The present work describes a comprehensive review of the functionalization of cyclopropyl C-H bonds via transition-metal catalysis. Compared to the enormous number of publications related to direct sp 2 and sp 3 bond transformations in the last two decades, the first full account of direct cyclopropyl C(sp 3 )-H bond functionalization was only disclosed in 2011. Both intra-and intermolecular transformations are detailed in the review, including asymmetric reactions. In addition, mechanistic aspects of various Pd-catalyzed cyclopropane functionalizations are discussed.