- Birth: 1560
- Death: 1639
- Other names: Hikozaemon, Tadakatsu
- Japanese: 大久保忠孝 (Ookubo Tadataka)
Ôkubo Tadataka was the 8th son of Ôkubo Tadakazu. From 1576 he served his older brother Tadayo in numerous battles. In 1580, he received a fief worth 2000 koku.
Tadataka is buried at Ryûgyô-ji, a Buddhist temple he established. The temple was relocated to its current location in the Takanawa neighborhood of Edo/Tokyo in 1668.