| Taki-no-jō Japanese: 滝の城 | |
| Coordinates: | 35.8006°N 139.5317°W |
| Map Type: | Japan Saitama Prefecture#Japan |
| Map Relief: | 1 |
| Location: | Tokorozawa, Saitama Prefecture, Japan |
| Type: | Japanese castle |
| Built: | Sengoku Period |
| Builder: | Ōishi Sadahisa |
| Demolished: | 1590 |
| Condition: | Ruins |
| Controlledby: | Oishi clan |
is a flatland-hilltop Japanese castle ruin located in Tokorozawa, Saitama Prefecture. It was on a key route between the northern Kanto Plain and Hachioji.
The most recent structure was built in the 15th century by Ōishi Sadahisa and existed during the 16th-century Sengoku period of Japanese history. In 1546, the Hojo of Odawara took control and in 1569 possession passed to the Takeda.[1] Then Go-Hōjō clan expanded and improved the defences of the castle.[2]
After 1590, the castle was abandoned simultaneously with the arrival of Tokugawa Ieyasu into the region, having outlived its purpose.
The castle is now a ruin, with clear archeological evidence of the foundations of a number buildings and a dry moat. The castle name "Taki-no-jō", which literally means "waterfall castle", is due to a waterfall that exists on the eastern part of the castle grounds. The castle grounds now form a recreational park including walking paths, a children's play area and a baseball field. The park is called .