Alpine County Airport (FAA LID: M45) is a county-owned public-use airport located three nautical miles (6 km) north of the central business district of Markleeville, in Alpine County, California, United States.

It is in the eastern Sierra Nevada range and serves as a general aviation airport. The airport has a single runway, with an apron to park small light aircraft. The airport has no buildings, no lights and is rarely used, averaging only 54 aircraft movements per month.

It is the only operational airport in Alpine County.