The EMD GP15 is a 4-axle diesel-electric locomotive built by General Motors Electro-Motive Division between June 1976 and April 1983.

The GP15AC differs from the others as it uses an AC alternator connected to the engine instead of a DC generator to drive the traction motors.

EMD built a total of 310 units for American railroads in this variant between June 1976 and March 1982.

This model differs from the GP15-1 due to Missouri Pacific specifying new AR10 AC alternators instead of rebuilt D32 DC generators.

34 examples of this locomotive model were built in total: 30 for Missouri Pacific Railroad, and four for Venezuela's IFE.