Toyama Castle (Toyama-jō), also called Azumi Castle (Azumi-jō), is a castle in Toyama city, Toyama Prefecture, Japan. Built in 1543, the castle and its surrounding land is maintained by the government of Japan as a public park. In 1581, Sassa Narimasa, a retainer of Oda Nobunaga became lord of the castle. After the Honnoji Incident of 1585, there was a falling out between Sassa Narimasa and Hideyoshi, and Hideyoshi attacked the castle with 100,000 soldiers, destroying it.
Maeda Toshinaga later rebuilt the castle and temporarily used it as his retirement home until much of it burned down in 1609. In 1661 Maeda Toshitsugu rebuilt the castle again and made it his home. His descendents ruled over Toyama from here until the Meiji Restoration, when it was dismantled in 1870.