Duffer may refer to:
Duffer (Narnia), invisible dwarves in The Chronicles of Narnia the Duffer Brothers, American film and television show makers known for their role on Stranger Things Duffer, in Australian English, a person occupied in cattle raiding A weak player in the game of chess Students organized to boost the spirit of the school during athletic and social events, often brought together during pep rallies.
In biology: Discophora (butterfly), a genus of butterflies commonly known as duffers Banded duffer (Discophora deo), a butterfly found in Asia Common duffer (Discophora sondaica), a butterfly found in Southeast Asia Great duffer (Discophora timora), a butterfly found in South Asia Southern duffer (Discophora lepida), a butterfly found in India
See also The Defence of Duffer's Drift, a 1904 book by Ernest Dunlop Swinton