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 was a kokujin, or provincial landowner, 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 clan was 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, he appeared to have separated from the Uesugi and served the Ogasawara clan based on Takatenjin Castle in Tōtōmi Province.  In the First battle of Takatenjin Castle, he died while fighting the Takeda clan.