Defil is a Polish musical instruments manufacturer founded in the second half of the nineteenth century. It was in existence until 2007 when stricter emissions regulations forced the closure of its factory.

Defil was the major Polish guitar manufacturer from the 1960s to the 1990s. They produced a range of very low quality guitars. Defil created their own models, similar to famous models of well known guitar brands, but not faithful copies. The quality of workmanship and tone of these instruments were poor. Thus Defils have only curiosity or sentimental value. Inadequate seasoning of the wood used in their manufacture contributed to the poor quality of the guitars.

DEFIL is an acronym for Dolnoslaska Fabryka Instrumentow Lutniczyc.