The first general, highlyenantioselectivehydrosilylation of benzoxazinones and quinoxalinones has been developed. The chiral Lewisbase organocatalysts that are readily accessible from (1S,2R)‐ephedrine and (1R,2S)‐ephedrine promoted the title reaction to afford various chiral dihydrobenzoxazinones and dihydroquinoxalinones with good yields as well as good enantioselectivities.