Akiko Sekine (関根 明子, Sekine Akiko, née Hirao; born August 30, 1975) is an athlete from Japan, who competes in triathlon.

She competed at the first Olympic triathlon at the 2000 Summer Olympics.

She took seventeenth place with a total time of 2:04:18.70.

She took twelfth place with a total time of 2:07:34.02.

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