Duo Airways was an airline based in the United Kingdom.

The airline was formed by a management buyout of the former Maersk UK in June 2003.

The airline relaunched services in November 2003 but a shortage of funds led to it suspending flights and entering administration on 1 May 2004.

The airline sought to provide a high quality of service at moderate prices, but faced a marketing challenge in explaining that it was not a low cost, no-frills carrier, and load factors took longer than expected to reach budgeted levels.

Despite overwhelmingly positive reaction from passengers and an encouraging outlook, the airline had to close down when an investor withdrew support at short notice.