Middletown Regional Airport, also known as Hook Field, (IATA: MWO, ICAO: KMWO, FAA LID: MWO) is a city-owned public-use airport located two nautical miles (3.7 km) north of the central business district of Middletown, a city in Butler County, Ohio, United States. The airport was renamed in October 2008; it was previously known as Hook Field Municipal Airport.

In late August 2008 the airport gained some national prominence when the Republican vice presidential nominee Sarah Palin flew into Hook to later attend a Dayton campaign rally where she was announced as Senator John McCain's running mate.

The airport is home to the Ohio Challenge Hot Air Balloon Festival, an annual event for over 20 years. There is also a nonprofit museum at the airport hosted by Butler County Warbirds, Inc.