Margeir Pétursson (born 15 February 1960) is an Icelandic banker and chess grandmaster.

[12] After eight years as a professional chess player, Margeir founded a securities company in 1999.

In February 2018, he acquired a 99.8% stake in the Lviv-based financial company Integral Investments.

[16] In a 2016 interview with The Ukrainian Week, Margeir said he moved to Lviv in 2004 and has been living in the city permanently since 2011.

[4] A fluent speaker of Ukrainian, he acted as a translator for Heimir Hallgrímsson, manager of the Iceland national football team, during the Ukraine–Iceland game held on 5 September 2016 in Kyiv.