Gunnar Þór Guðjónsson is an Icelandic former strongman competitor who won the title of Iceland's Strongest Man, and competed at the World's Strongest Man and then went on to become a champion bodybuilder.

In 1998 he came second in the renowned Iceland's Strongest Man, an event that despite its name had for a number of years been open to international competitors.

In 1998 he was invited to the World's Strongest Man competition but did not make it past the qualifying heat.

A win in Iceland's Strongest Man in 2000[1] led to another invitation in 2000 but he was unable to attend due to injury and Torfi Olafsson took his place.

[2] This injury led to Gunnar reassessing his sporting career and he became a bodybuilder.