ALN, AlN or Aln may refer to:
The Township of Alnwick/Haldimand is a township in central Ontario, Canada, in Northumberland County, situated between Lake Ontario and Rice Lake.
Alnwick (/ˈænᵻk/) is a large market town in north Northumberland, England. The population at the 2011 Census was 8,116.
Alnwick Castle (/ˈænᵻk/) is a castle and stately home in Alnwick in the English county of Northumberland.
Alnus glutinosa, the common alder, black alder, European alder or just alder, is a species of tree in the family Betulaceae, native to most of Europe, southwest Asia and northern Africa.
Alnus rubra, the red alder,
Alnashsky District (Russian: Ална́шский райо́н; Udmurt: Алнаш ёрос) is an administrative and municipal district (raion), one of the twenty-five in the Udmurt Republic, Russia.
Alnico is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of aluminium (Al), nickel (Ni) and cobalt (Co), hence al-ni-co.
Alnitak, designated Zeta Orionis (ζ Orionis, abbreviated Zeta Ori, ζ Ori) and 50 Orionis (50 Ori), is a multiple star several hundred parsecs from the Sun in the constellation of Orion.
Alnus incana (grey alder or speckled alder) is a species of alder with a wide range across the cooler parts of the Northern Hemisphere.