Okajima (written: 岡島, 岡嶋) is a Japanese surname. Notable people with the surname include:
Hideki Okajima (born 1975), former Japanese professional baseball pitcher Kanata Okajima (born 1984), Japanese singer and songwriter Kiyonobu Okajima (born 1971), former Japanese football player Koji Okajima (born 1957), figure skating coach Tae Okajima, Japanese voice actress Takero Okajima (born 1989), Japanese professional baseball catcher , Japanese ice hockey player Okajima Satoshi, Japanese Army officer
Fictional characters , a character in the Assassination Classroom anime and manga Takeo Okajima, a character in the Studio Ghibli film Only Yesterday