Takanashi Hidemasa served as a bushō during the Sengoku period.

Hidemasa was born as the son of Takanashi Masayori or Takanashi Kiyohide (Masayori’s uncle or brother).

The Takanashi clan were kokujin, or provincial landowners, in the northern part of Shinano Province.  In the era of Masayori, after the Kai-Takeda clan advanced into Shinano, the Takanashi sought support from the Nagao (Uesugi) clan of Echigo Province and showed signs of becoming subservient to the clan.  Hidemasa participated in the Fourth Battle of Kawanakajima but the Takanashi were unable to recover their former territory.

There are many uncertainties concerning the second half of Masayori’s life so Hidemasa’s movements are also unclear.  At a later time, however, Hidemasa appeared to have separated from the Uesugi and served the Ogasawara clan based at Takatenjin Castle in the Kitō District of Tōtōmi Province.  During the First Siege of Takatenjin Castle, Hidemasa died while attempting to defend the castle against an assault by Takeda forces.