Jón Ólafur Jónsson (born 14 July 1981), also known as Nonni Mæju,[1][2] is an Icelandic basketball player and a former member of the Icelandic men's national basketball team.

He was a key player on the Snæfell team that won the Icelandic championship, the Icelandic Basketball Cup, the Icelandic Supercup and the Icelandic Company Cup in 2010.

He retired from top-level play after the 2013–14 season due to lingering injuries.

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