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

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  • Ichioka Station (市岡駅, Ichioka-eki), a train station in Niimi, Okayama Prefecture, Japan