Jóhannes Helgason (born 16 June 1958) is an Icelandic guitar player known for his work in the band Þeyr.
In the winter of 1972 he joined vocalist Guðmundur Eyjólfsson, drummer Hilmar Örn Hilmarsson, and bassist Birgir Ottóson to form a school band called Fatima.
In 1979 Frostrósir changed its name to Þeyr and Hilmar Örn Hilmarsson collaborated with some lyrics and managed the band with Guðni Rúnar Agnarsson.
In 1998, record label Spor released a compilation CD titled Nælur, which contained three songs by Þeyr, including “En”, from Þagað í Hel, which became into the only song reissued because the remaining tracks of this album were lost in a fire at the Tóntækni studios a few years after the debut album was released.
He started to work at Flugtak for two years, and later as a flight instructor for Hnit Consulting Engineers.