Dayton International Airport (IATA: DAY, ICAO: KDAY, FAA LID: DAY) (officially James M. Cox Dayton International Airport, formerly Dayton Municipal Airport and James M. Cox-Dayton Municipal Airport) is 10 miles north of downtown Dayton, in Montgomery County, Ohio, United States. The airport is in an exclave of the city of Dayton not contiguous with the rest of the city. Its address is 3600 Terminal Drive, Dayton, Ohio 45377. The airport is headquarters for American Eagle carrier PSA Airlines.

The National Plan of Integrated Airport Systems called it a primary commercial service airport. Dayton International is the third busiest and third largest airport in Ohio behind Cleveland Hopkins International Airport and John Glenn Columbus International Airport. (While Cincinnati's airport is also busier, it is located in the neighboring state of Kentucky.)

Dayton International Airport handled 2,607,528 passengers in 2012 and had 57,914 combined takeoffs and landings in 2012. Dayton ranked No. 76 in U.S. airport boardings in 2008. The airport has non-stop flights to 17 destinations.