ALN, AlN or Aln may refer to:
The Alna Line (Norwegian: Alnabanen) is a 4.3-kilometer (2.7 mi) railway line between Alnabru and Grefsen in Oslo, Norway.
The Township of Alnwick/Haldimand is a township in central Ontario, Canada, in Northumberland County, situated between Lake Ontario and Rice Lake.
Alnwick Castle (/ˈænᵻk/) is a castle and stately home in Alnwick in the English county of Northumberland.
Alnwick (/ˈænᵻk/) is a market town in north Northumberland, England. The population at the 2011 Census was 8,116.
Alnur Mussayev (Kazakh: Әлнұр Мұсаев) was the former head of Kazakhstan's National Security Committee (KNB) under the tenure of President Nursultan Nazarbayev.
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,
Alnarpsströmmen is a subterranean aquifer under the Swedish province of Skåne. It has been used for wells since at least the 18th century and as a fresh water source for Malmö since 1901. Several other towns use it today.
Alnus incana (grey alder or speckled alder) is a species of alder with a wide range across the cooler parts of the Northern Hemisphere.