- Born: 1656
- Died: 1713
- Titles: Kaga-no-kami, rôjû
- Japanese: 大久保忠増 (Ookubo Tadamasu)
Ôkubo Tadamasu was a son of Ôkubo Tadatomo. He was named Kaga-no-kami in 1705 and served as rôjû from that year until 1713.
- Arai Hakuseki, Joyce Ackroyd (trans.), Told Round a Brushwood Fire, University of Tokyo Press (1979), 313n53.