Lan (in English lan; in Latin laneus, in German Lahn), in Polish means "field," and is a unit of land measurement used in Poland. Since the 13th century, its value has varied from one location to another. A Franconian lan consisted of 43.2 morgs = 23 to 28 hectares. The term lan was also used to indicate a full-sized farm, as opposed to one split up into a number of smaller sections. In medieval times its value was anywhere between 3 and 50 hectares, but from the 13th century to 1857 in Great Lesser Poland (with Podkarpacie), the Franconian Lan was consistently used.

[Image:SverigesLän2007mKod.svg|thumb|290px|Län of Sweden

• Stockholm County (AB)
• Uppsala County (C)
• Södermanland County (D)
• Östergötland County (E)
• Jönköping County (F)
• Kronoberg County (G)
• Kalmar County (H)
• Gotland County (I)
• Blekinge County (K)
• Skåne County (M)
• Halland County (N)
• Västra Götaland County (O)
• Värmland County (S)
• Örebro County (T)
• Västmanland County (U)
• Dalarna County (W)
• Gävleborg County (X)
• Västernorrland County (Y)
• Jämtland County (Z)
• Västerbotten County (AC)
• Norrbotten County (BD)

]] Län (Swedish) and lääni (Finnish) refer to the administrative divisions used in Sweden and previously in Finland. The provinces of Finland were abolished on January 1, 2010.

LAN may refer to:

• Local area network, a computer network covering a small local area, such as a home or office
  • LAN party, social happening on a local area network
• Local asymptotic normality, a fundamental property of regular models in statistics
• Lancaster railway station, England (National Rail station code "LAN")
• Lansing, Michigan Capital Region International Airport (IATA airport code "LAN")
• Light At Night, medical term for sleeping with a light on
• LAN Airlines, an airline in Chile, with a stake in other airlines
  • LAN Peru, an airline based in Peru
  • LAN Ecuador, an airline based in Quito, Ecuador
  • LAN Argentina, an airline based in Buenos Aires, Argentina
  • LAN Dominicana, an airline based in Santo Domingo, Dominican Republic
  • LAN Colombia, an airline based in Bogotá, Colombia

A local area network (LAN) is a computer network that interconnects computers in a limited area(not exceeding 1 km) such as a home, school, computer laboratory, or office building using network media. The defining characteristics of LANs, in contrast to wide area networks (WANs), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines.