Navi Mumbai International Airport (IATA: NMI, ICAO: none) is an international airport being constructed in Ulwe, Navi Mumbai, Raigad district, Maharashtra, India. When completed, it will become the second airport of the Mumbai Metropolitan Region, serving alongside Mumbai's existing Chhatrapati Shivaji Maharaj International Airport.

The greenfield airport is being built by the City and Industrial Development Corporation (CIDCO) through a public–private partnership (PPP) model on a Design, Build, Finance, Operate, and Transfer (DBFOT) basis in three phases. The first phase will be able to handle 25 million passengers per annum. It will be expanded to its final capacity of third phase to handle more than 90 million passengers and 2.5 million tonnes of cargo per annum, by 2032. L&T Infrastructure Engineering Limited is the detailed design consultant for the project. CIDCO appointed Rail India Technical and Economic Service (RITES) to prepare the masterplan of the airport. The Texas-based Jacobs Engineering Group, prepared a detailed terminal area and facilities model to define the size of the terminals, while the passenger terminals and the air traffic control (ATC) tower have been designed by London-based Zaha Hadid Architects.

The ₹16,700 crore (US$2.0 billion) project is being executed by Navi Mumbai International Airport Limited (NMIAL), a special-purpose vehicle formed by the Adani Airports Holdings Limited and CIDCO, which will hold 74% and 26% equity shares of NMIAL respectively. The airport covers an area of 1,160 ha (4.5 sq mi).