Continental O-520

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O-520
Preserved IO-520
Type	Piston aircraft engine
National origin	United States
Manufacturer	Teledyne Continental Motors
First run	1963
Major applications	Beechcraft Bonanza Beechcraft Baron Cessna 206 Cessna 210 Cessna 310 Cessna 340 Cessna 421
Produced	1964-present
Developed from	Continental IO-346
Developed into	Continental IO-550

The Continental O-520 is a six-cylinder, horizontally opposed aircraft engine produced by Teledyne Continental Motors. First run in 1963 as a development of the IO-346, it has been produced in versions incorporating fuel injection (IO-520), turbo-charging (TSIO-520), and gearing (GTSIO-520).