Lancet – A tall, narrow window in the Gothic style with a pointed head.
Lime Kiln - Large outdoor, stone made kiln for making lime. Often found on farms.
Linkardstown burial - This is a form of cist tomb that is pentagonal in shape and has sloping orthostats forming the chamber. They are quite rare.
Loggia - A covered gallery or corridor which is supported by a series of columns and exposed to the elements on one side. Intended as a place of leisure it functioned as an outdoor sitting room and is highly associated with warmer climates in Southern Europe although Irish examples can be found.