A compound cycle engine (10) has at least one rotary unit (12) defining an internal combustion engine, a velocity turbine (26) in proximity of each unit (12), and a turbocharger (18). The exhaust port of each rotary unit (12) is in fluid communication with the flowpath of the velocity turbine (26) upstream of its rotor. The rotors of the velocity turbine (26) and of each rotary unit (12) drive a common load (16). The outlet of the compressor (20) of the turbocharger (18) is in fluid communication with the inlet port of each rotary unit (12), and the inlet of the pressure turbine (22) of the turbocharger (18) is in fluid communication with the flowpath of the velocity turbine (26) downstream of its rotor.