Guglielmo Malaspina of Fosdinovo

Guglielmo Malaspina was a son of Azzolino II Malaspina and nephew of Spinetta Malaspina il Grande, lord of Fosdinovo. When Spinetta died in 1352 without legitimate heirs, Guglielmo and his brothers Gabriele and Galeotto succeeded to his lands. In 1355 Emperor Charles IV raised their fief to a marquisate.

After Gabriele died in 1359, the surviving brothers divided the lands in 1361, Galeotto taking Fosdinovo. Guglielmo died in 1368, leaving a daughter named Taddea.