Lanthanum manganite is an inorganic compound with the formula LaMnO3, often abbreviated as LMO.

Lanthanum manganite is formed in the perovskite structure, consisting of oxygen octahedra with a central Mn atom.

These vacancies generate a structure with a rhombohedral unit cell in this perovskite.

[3] Lanthanum manganite can be prepared via solid-state reactions at high temperatures, using their oxides or carbonates.

It is the parent compound of several important alloys, often termed rare-earth manganites or colossal magnetoresistance oxides.