Leandro N. Alem is a department of the province of Misiones, Argentina. It borders the departments of Capital, Oberá, Candelaria, Apóstoles, Concepción, and San Javier.
The department covers an area of 1,070 km², equivalent to 3.6% of the total province area. Its population is 45,075 (2010 census, INDEC).