Ichioka (written: 一岡) is a Japanese surname. Notable people with the surname include:
- Ryuji Ichioka (一岡 竜司, born 1991), Japanese baseball player
- Yuji Ichioka (1936–2002), American historian and activist
See also
edit- Ichioka Station (市岡駅, Ichioka-eki), a train station in Niimi, Okayama Prefecture, Japan