Ujii Sukemoto served as a bushō during the Sengoku and Azuchi-Momoyama periods.
The Ujii clan, a branch of the Nagano-Kudō clan, were kokujin, or provincial landowners, in Ise Province.
Sukemoto was born as the son of Nagano Tanefuji (the fourteenth head of the Nagano-Kudō clan) and succeeded to the Ujii clan, a cadet family. As a consequence of the invasion of Ise by Oda Nobunaga, in the second month of 1568, the Nagano-Kudō clan adopted Oda Nobukane (the younger brother of Nobunaga). Sukemoto acknowledged this adoption and agreed to serve as a retainer of the Oda. Thereafter, he approached Nobunaga in an effort to enable a continuation of the Ujii clan, but, owing to differences with Nobukane, in 1580, he was dispossessed of his base at Ujii Castle and ousted.
As a result, he turned to his son-in-law, Yabe Iesada, for assistance, and, through this connection, was allowed to serve as a direct retainer of Nobunaga, albeit for a small stipend. After the death of Nobunaga, he returned to Ise. In 1584, at the Battle of Komaki-Nagakute, he fought on the side of Hashiba Hideyoshi.
Sukemoto’s son, Sukemitsu (Hyōbu-taifu) was the son-in-law of Takigawa Kazumasu. After wandering several provinces, he was brought in to serve under Toyotomi Hideyoshi.