Ólafur Davíð Jóhannesson (born 30 June 1957 in Reykjavík) is an Icelandic football manager and former player who formerly managed the Icelandic national team.
As an athlete himself, he played most of his years as a senior player with Haukar but started his career as manager only 24 years of age with the team Einherji from Vopnafjörður.
He has managed Einherji, Skallagrímur, FH, Þróttur, Haukar, Selfoss, ÍR and Valur.