Ōshima Takatō (大島 高任, May 11, 1826–March 29, 1901) was a Japanese engineer who created the first reverberation blast furnace and first Western-style gun in Japan.
Ōshima was born of samurai status in Morioka City, Nanbu Domain which is now Iwate Prefecture in 1826.
Around this time the feudal clans of Japan were competing to develop superior Western-style armaments.
Ōshima returned to Nanbu-han where he built a new Western-style blast furnace at Kamaishi to produce a higher quality pig iron from the local magnetite mined there.
They used a design from a Dutch book Het Gietwezen In's Rijks Ijzer-geschutgieterij Te Luik by Huguenin.