Okabe (written: 岡部) is a Japanese surname. Notable people with the surname include:

• Jiro Okabe (岡部 次郎, 1864–1925), Japanese politician
• Keiichi Okabe (岡部 啓一, born 1969), Japanese music composer
• Kenji Okabe (岡部 健二, 1915–?), Japanese World War II flying ace
• Kinjiro Okabe (岡部 金治郎, 1896–1984), Japanese electrical engineer and scientist
• Kiyoko Okabe (岡部 喜代子, born 1949), Japanese judge
• Leandro Okabe (born 1985), Japanese-Brazilian model
• Okabe Motonobu (岡部 元信, died 1581), Japanese samurai
• Naozaburo Okabe (岡部 直三郎, 1887–1946), Japanese general
• Noriaki Okabe (岡部 憲明, born 1947), Japanese architect
• Rin Okabe (岡部麟, born 1996), Japanese singer
• Toru Okabe (岡部 通, 1889–1961), Japanese general
• Yoshiro Okabe (岡部 芳郎, 1884–1945), Japanese engineer and assistant of Thomas Edison
• Yukiaki Okabe (岡部 幸明, born 1941), Japanese swimmer

Fictional characters

• Keiko Okabe, a character in the novel Hotel on the Corner of Bitter and Sweet
• Rintarō Okabe (岡部 倫太郎), protagonist of the visual novel Steins;Gate