Þorsteinn Leó Gunnarsson (born 13 November 2002) is an Icelandic handball player for FC Porto and the Icelandic national team.
He represented Iceland at the 2025 World Men's Handball Championship.
Personal life Þorsteinn's sister is Erna Sóley Gunnarsdóttir, the first female shot putter to represent Iceland at the Olympic Games.
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