We demonstrate hydrohalogenation of aliphatic alkenes with collidine·HX salts through dualphotoredox/cobalt catalysis. The dualcatalysis enables conversion of a proton and a halide anion from collidine·HX salt to a nucleophilic hydrogen radical equivalent and an electrophilic halogen radical equivalent and delivery of them to an alkene moiety. This protocol allows for introduction of fluorine, chlorine