Aymar-DeMuth Propellers was an American manufacturer of wood laminate and composite propellers for homebuilt aircraft. The company headquarters was located in Ellicott City, Maryland.
The company produced a line of two-bladed maple laminate propellers as well as wood-glass composite designs for aircraft with two-stroke or four stroke engines up to , such as the Van's Aircraft RV-7, Thorpe T-18 and Glasair.
The company discontinued operations in 2012 after the death of its founder, Mike DeMuth.