L. M. Clayton Airport (IATA: OLF, ICAO: KOLF, FAA LID: OLF) is a public airport three miles east of Wolf Point, in Roosevelt County, Montana, United States. The airport is served by one airline, subsidized by the Essential Air Service program. Reportedly, it is the smallest airport in the 48 contiguous states with scheduled air service.

The Federal Aviation Administration says this airport had 321 passenger boardings (enplanements) in calendar year 2008, 900 in 2009 and 494 in 2010. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a general aviation airport (the commercial service category requires at least 2,500 enplanements per year).

Scheduled air service temporarily ceased on March 8, 2008, when Big Sky Airlines ended operations in bankruptcy. Great Lakes Airlines was given USDOT approval to take over Essential Air Service (EAS) and flights began in 2009. Service is currently provided under EAS contract by Cape Air.

The first airline flights were Frontier DC-3s in 1954–55; Frontier pulled out in 1980.