Katsurayama Ujihiro served as a bushō during the Sengoku period.  He was the lord of Katsurayama Castle in Suruga Province.

Under one theory, Ujihiro was the third son of Ise Sōzui (Hōjō Sōun). In this case, he would have been born between the birth date of his older brother, Hōjō Ujitsuna, in 1487, and the birth date of his younger brother, Hōjō Nagatsuna, in 1493 (or 1501).  Alternatively, he was the son of Hōjō Ujitoki (who was the second son of Sōzui).  In any event, Ujihiro was a member of the Gohōjō clan.

Ujihiro was adopted by the Katsurayama clan, kokujin, or provincial landowners, with expansive holdings in the eastern portion of Suruga.  He inherited the headship of the clan.  Among the consorts of Sōzui was a daughter of the Katsurayama clan who was the mother of Ujihiro.  As a result, there is a high likelihood that this relationship is connected to his adoption by the Katsurayama.

He first appears in a record from the first month of 1524 in which he granted land to a retainer named Seki Magokurō.  The Katsurayama were obedient to the Imagawa clan and Ujihiro maintained a residence in Sunpu from which to serve the Imagawa.

On 4/13 of Tenbun 1 (1532), he adopted the official title of nakatsukasa-shōyū, or Assistant Vice-Minister of Central Affairs.  In 1537, when his older brother Hōjō Ujitsuna fought against Imagawa Yoshimoto in the Katō Conflict, Ujihiro sided with Ujitsuna.

In the ninth month of 1538, he appeared to have fallen seriously ill and, in a bid for his recovery, he received recitations of the Mahāprajñāpāramitā Sūtra from the Tsurugaoka-Hachiman Shrine.  He died in the fourth month of 1539 although his age at the time is uncertain.