Sugiyama Castle (杉山城, Sugiyama-jō), also known as Makino Castle, was a Sengoku period Japanese castle located in what is now part of the town of Ranzan, Hiki District, Saitama, in the Kantō region of Japan.

[4] Sugiyama Castle in located on a hill in the town of Ranzan, near the center of Saitama Prefecture at the border of the Kantō Plain and the Chichibu Mountains.

Situated on a long and narrow ridge, to consists of a series of enclosures built on different levels, separated by clay ramparts and dry moats, and connected by narrow, winding paths with many dead ends to confuse attackers and to permit defenders to fire back from many angles from above.

Due to its design, it was originally though that the castle was the work of the Later Hōjō clan, although arguments have been raised by historians that Hōjō castles tend to have much larger defensive engineering works, and the Uesugi clan has been advanced as another likely candidate.

[5] The castle site is a 30 minute walk from Musashi-Ranzan Station on the Tōbu Tōjō Line.