Katsumi Ōno (大野 勝己 Ōno Katsumi, April 6, 1905 - Setagaya Ward, Tokyo, September 1, 2006) was a Japanese diplomat.
He entered the Japanese Ministry of Foreign Affairs in 1929 and served as Vice Minister of Foreign Affairs in 1957-1958. He served as Ambassador to the United Kingdom in 1958-1964.