Higashishiiya Falls, Waterfall in Usa, Japan.

Higashishiiya Falls is a waterfall on the Taki River in the Ajimumachi-Higashi-Shiiya district of Usa, Ōita Prefecture. It drops about 85 meters down a vertical cliff face into a wide plunge pool, and the gorge below the pool continues through the valley. The falls are counted among Japan's Top 100 Waterfalls and are one of the three waterfalls of Usa.

The falls were placed on Japan's Top 100 Waterfalls list, compiled by the Environment Ministry in 1990. The list also includes the nearby Nishishiiya and Fukino falls, which together with Higashishiiya are called the three waterfalls of Usa.

The falls are also called "Kegon of Kyushu", a name recorded in Japanese sources alongside its use as a site of Kannon worship. Together with Nishishiiya Falls and Fukino Falls it forms the "Three Waterfalls of Usa", all in the Usa area of northern Ōita Prefecture.

The site is roughly a 20-minute drive from Ajimu Interchange and has parking for about 60 vehicles and some larger ones as well. Weather conditions can affect water flow and visibility, so checking conditions before visiting is helpful.

The waterfall changes its appearance through seasons, with spring greenery and autumn red leaves framing the cascading waters.