Eric (Don Ericus) Ragnor Sventenius (born Erik Ragnar Svensson; also known simply as Eric (Erich, Enrico) Ragnor) (10 October 1910 — 23 June 1973) was a Hispano-Swedish botanist.Born in the small town of Skirö, Vetlanda, he studied in various universities across Europe.
In Spain, he studied at the Marimurta Botanical Garden in Blanes which had been founded in 1920 by Karl Faust.
Sventenius proposed creating a botanical garden dedicated to Canarian flora, continuing the work begun by José de Viera y Clavijo.
At Gran Canaria, he founded Jardín Botánico Canario Viera y Clavijo in 1952 at Tafira Alta, c. 7 km southwest of Las Palmas.
His grave is in the Canarian Botanical Garden "Viera y Clavijo", right next to a rock where he used to sit and meditate, relax and listen to the birds.