Sveinbjörn Egilsson (24 February 1791 – 17 August 1852) was an Icelandic theologian, classicist, teacher, translator and poet. He is best known for the work he did during his time as the rector of The Learned School of Reykjavík (Lærði skólinn í Reykjavík), particularly his translations of Homer's Odyssey and Iliad into Icelandic.
Sveinbjörn was born in Innri-Njarðvík in Gullbringusýsla, Iceland. He was the son of Egill Sveinbjarnarson, a little-known but wealthy farmer. Sveinbjörn was fostered by Magnús Stephensen and was educated by a number of different individuals. In 1810 he graduated from the tutelage of Árni Helgason and started his studies in theology at the University of Copenhagen in 1814, completing his degree in 1819. Returning to Iceland, he received a position at Bessastaðaskóli, and when the school moved to Reykjavík he was made rector. He was a founding member of Fornfræðafélagið, a society of ancient studies.
When troubles arose in the school, with students protesting their treatment ("The Pereat"), Sveinbjörn left for Copenhagen to seek the assistance of Danish educational authorities. Although he received their support, he left his position as rektor in 1851 and died a year later.
Sveinbjörn was married to Helga Gröndal, daughter of high judge Benedikt Gröndal the elder.
His main subject as a teacher was Greek. During his position at the school, he worked on a number of translations, translating amongst other things Plato's Meno and Homer's Odyssey and Iliad into Icelandic.