Marko J. Tuomainen (born April 25, 1972) is a Finnish former professional ice hockey player who played in the National Hockey League and SM-liiga.

He played for KalPa, HIFK, Espoo Blues, Edmonton Oilers, Los Angeles Kings, and New York Islanders.

He last played in the Mestis with Kiekko-Vantaa during the 2011–12 season.

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