Ludwigite is a magnesium-iron borate mineral: Mg<sub>2</sub>FeBO<sub>5</sub>.
Ludwigite typically occurs in magnesian iron skarn and other high temperature contact metamorphic deposits. It occurs in association with magnetite, forsterite, clinohumite and the borates vonsenite and szaibelyite.
thumb|left|Ludwigite needles and sprays as inclusions in a [[peridot crystal from Sapat Gali, Kohistan District, Pakistan. Size 2.8 x 2 x 1.1 cm.]]