Radical cyclizations are a powerful strategy to forge C-C bonds. These intramolecular processes benefit from very rapid kinetics, can generate multiple bonds in one transformation, and enable unique reactivity pathways for the synthesis of complex scaffolds. Although radical processes have traditionally relied on harmful reagents and harsh conditions, photoredox catalysis has emerged as a method of choice for performing radical chemistry under mild, non-toxic conditions. Radical cyclizations typically involve the addition of a carboncentered radical to a C-C π bond, leading to cyclic products (Scheme 1a). This strategy has been widely employed to produce both saturated and unsaturated allcarbon rings and heterocycles. Stereoselective radical cyclizations, moreover, have been used to access enantioenriched cyclic frameworks, which feature e.g. in many pharmaceuticals and natural products. The use of silicon-substituted alkenes and alkynes in radical cyclizations has, however, remained relatively underexplored. Due to the controllable lability of organosilanes, the cyclic products of these reactions can undergo ring-opening, which leads to an overall group transfer reaction of the vinyl or alkynyl substituent from silicon to carbon. Radical group transfer reactions of vinyl and alkynyl silanes have previously been performed using traditional radical initiators, e.g. on cyclic alkyl iodide substrates (Scheme 1b). Following the radical cyclization reaction, addition of a fluoride source results in elimination and desilylation. A similar strate-gy has also been applied to activated, tertiary bromides, and in a radical cyclization cascade strategy to set multiple contiguous stereocenters.