Guntars Mankus (born 5 July 1969), is a Latvian orienteer, rogainer and adventure racer.
At the 5th World Rogaining Championships in Lesná, Czech Republic in 2002, he won a gold medal and the title of the World Rogaining Champion in Mixed Open category in team with Anita Liepina and Raimonds Lapià Âà ¡. At 6th World Rogaining Championships in Arizona, United States in 2004, the same team won a bronze medal in Mixed Open category. At 7th World Rogaining Championships in Warrumbungles, Australia, they regained the title of the World Rogaining Champion in Mixed Open category. At 13th World Rogaining Championships in Kiilopää, Finland he won a silver medal in Mixed Open category in team with Irita Pu֑te. At 18th World Rogaining Championships in Sierra Nevada, California, USA, he won a gold medal in Mixed Open category in team with Irita Pu֑te.
In 2005, he won a gold medal at the European Rogaining Championships in Mixed Open category in team with Anita Liepina in Nõva, Estonia. In 2016, he won a gold medal at the European Rogaining Championships in Mixed Open category in team with Irita Pu÷ëte in Aralar Range, Spain.
In 2014, he won a gold medal and the title of the World Champion in precision orienteering (PreO Open) and a bronze medal as a member of the Latvian team at the World Trail Orienteering Championships in Lavarone, Italy.