The EMD GP9 is a four-axle diesel-electric locomotive built by General Motors' Electro-Motive Division between 1954 and 1959.

The GP9 succeeded the GP7 as the second model of EMD's General Purpose (GP) line,[1] incorporating a new sixteen-cylinder engine which generated 1,750 horsepower (1.30 MW).

[5] EMD built GP9s at its LaGrange, Illinois facility until 1959, when American production was ended in favor of the GP18.

Many rebuilt GP9s remain in service today with shortline railroads and industrial operators.

The Illinois Central Railroad rebuilt some of its GP9s with their front (short) hood reduced in height for improved crew visibility.