was a daimyà  during early-Edo period Japan. His courtesy title was Izumi-no-kami.
Aoyama Tadao was the second son of Aoyama Munetoshi, the daimyà  of Hamamatsu Domain (Tà Âtà Âmi Province), and was born in Komoro, Shinano Province. On his father's death in 1679, he became 4th head of the Aoyama clan and daimyà  of Hamamatsu Domain.
Aoyama Tadao was married to a daughter of Sanada Nobumasa, daimyà  of Matsushiro Domain in Shinano Province. He died in 1685 at the relatively young age of 35 without a direct heir, and the succession went to Aoyama Tadashige, the son of his younger brother. His grave is at the temple of Daitoku-ji in Kyoto.