Katōmado (火灯窓 or 花頭窓) is a style of window with a bell-shape.

— History

Katōmado date back to the end of the Muromachi period up to the Momoyama period. They were introduced to Japan from China when Zen Buddhism was brought over. This cusped window design is an element of Zen style architecture.

From around 1575 onward, Katōmado were used in shrines and temples, as well as castles and houses. They were very uncommon in rustic Chashitsu. In the early 1600s, the curved design, points, and flares at the bottom were exaggerated.