Abe Masahiro (阿部 正弘, December 3, 1819 – August 6, 1857) was the chief senior councilor (rōjū) in the Tokugawa shogunate of the Bakumatsu period at the time of the arrival of Commodore Matthew Perry on his mission to open Japan to the outside world. Abe was instrumental in the eventual signing of the Convention of Kanagawa in 1854. Abe did not sign the treaty himself or participate in the negotiations in person; this was done by his plenipotentiary Hayashi Akira. His courtesy title was Ise-no-kami.