The London Welsh School (Ysgol Gymraeg Llundain) is a Welsh medium primary school in London, England. The Welsh language is the language of instruction for all classes and activities. The London Welsh School's origins date back to language classes taught in 1955, and a dedicated school set up some two years later. Its official name is The Welsh School, London. For much of its history the school was the only Welsh medium institution located outside Wales until the opening of a Welsh language school in Patagonia, Argentina.