Photoinduced　nickel-catalyzed　demethylative　cyanation　and　decarboxylative　cyanomethylation　of　aryl　halides　are　described　here.　Commercially　available　bromoacetonitrile　was　found　to　act　as　an　efficient　cyanating　reagent　for　the　photoinduced　cyanation　reaction　in　the　absence　of　a　photocatalyst.　Moreover,　photoredox　and　nickel　dual-catalyzed　decarboxylative　cyanomethylation　of　aryl　halides　has　also　been　realized　using　cesium　cyanoacetate　under　mild　conditions.　A　series　of　aryl　and　benzyl　nitriles　bearing　diverse　functional　groups　were　prepared　with　good　to　high　efficiency.