Mahan Airlines, operating under the name Mahan Air, (Persian: هواپیمایی ماهان‎) is a private airline based in Tehran, Iran. It operates scheduled domestic services and international flights to the Far East, Middle East, Central Asia, and Europe. Its main base is Imam Khomeini International Airport, Tehran, Iran.

The airline was established in 1991 and began operations in 1992 as Iran's first private airline. It joined the IATA in 2001 and is owned by Mol-Al-Movahedin Organisation (96%). As of March 2007 it has 2,511 employees. At its operational launch in May 1993, Mahan Air fleet consisted of two Tupolev 154 aircraft, with a staff of 99 and a route network from Tehran to two domestic destinations. Growth was initiated with the addition of Airbus A300 wide-body aircraft to the fleet in 1999 and the Airbus A310 in 2001. This enabled the airline to reach beyond the regional destinations it served. Its route network now spans 28 destinations in 12 countries with a fleet of 25 Airbus and Boeing 747 aircraft. It holds 13% of all international flights from Iran, and 8% of the domestic market.

Mahan may refer to:

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).

Atmospheric stratification describes the structure of the atmosphere, dividing it into distinct layers, each with specific characteristics such as temperature or composition. The atmosphere has a mass of about 5×10¹⁸ kg, three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. An altitude of 120 km (75 mi) is where atmospheric effects become noticeable during atmospheric reentry of spacecraft. The Kármán line, at 100 km (62 mi), also is often regarded as the boundary between atmosphere and outer space.