5L or 5-L can refer to:
Transportation AeroSur (IATA code) 5L, a model of Toyota L engine Curtiss F-5L, see Felixstowe F5L SSH 5L (WA), former name of U.S. Route 12 in Washington Atlantic coast F-5L, see Felixstowe F.5 Auster J/5L, a model of Auster Aiglet Trainer British Rail Class 202 Diesel-electric multiple units (6L) when reduced to a five-carriage configuration British Rail Class 203 Diesel-electric multiple units (6B) when reduced to a five-carriage configuration by the removal of their buffet cars
Science and technology ORC5L TAF5L 5L, a model of HP LaserJet 5 AIX 5L, see IBM AIX
Other uses The Horns of Nimon (production code: 5L), a 1979–80 Doctor Who serial
See also L5 (disambiguation)