A chair blanket for keeping a person sitting on a chair warm without affecting the free body movements of the person. The chair blanket has a central section, a pair of upper wing flaps, and a pair of lower wing flaps. The central section is configured to mount to the back support of the chair. The pair of upper wing flaps and the pair of lower wing flaps extend from the central section. The pair of upper wing flaps drape over the shoulders of a person sitting on the chair and the pair of lower wing flaps drape over the thighs.