Quincy Regional Airport (IATA: UIN, ICAO: KUIN, FAA LID: UIN) (Baldwin Field) is a city-owned airport 12 miles east of Quincy, a city in Adams County, Illinois, United States. It is used for general aviation but also sees Southern Airways Express flights to Chicago's O'Hare International Airport and St. Louis Lambert International Airport, a service which is subsidized by the federal government's Essential Air Service program at a cost of $1,956,856 (per year). The Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2023–2027 categorized it as a national non-primary commercial service facility.

The first airline flights were on Mid-Continent in 1947; successor Braniff left in 1959. TWA arrived in 1948 and left in 1953-54; Ozark arrived in 1950 and left in 1982.

It is the least busy of the 12 commercial airports in Illinois.

Quincy has a solar panel project that is expected to be operational by the end of 2022.

The airport has often played host to events held by the International Stinson Club, including fly-ins, job fairs, and more.