Lafonia is a peninsula forming the southern part of East Falkland, the largest of the Falkland Islands.

East Falkland is the largest island of the Falklands in the South Atlantic, having an area of 6,605 km2 or 54% of the total area of the Falklands. The island consists of two main land masses, of which the more southerly is known as Lafonia; it is joined by a narrow isthmus where the settlement of Goose Green is located, and it was the scene of the Battle of Goose Green during the Falklands War.