The decision to re-open was made in close collaboration with the government and local authorities.
Blue Lagoon, Blue Cafe, Lava Restaurant, the Retreat Spa, Spa Restaurant and the on-site Blue Lagoon Skincare store have all reopened.
However, the Silica Hotel, Retreat Hotel and Moss Restaurant will remain closed until 21 December when the situation will be reassessed.
Helga Arnadottir, chief operator of sales, operations and services, said: "After several challenging weeks, we look forward to reopening our operations in Svartsengi. Our invaluable staff have been working tirelessly to ensure the guest experience will be both safe and joyful."
