Who is the sun goddess in Shinto mythology?

The sun goddess in Shinto mythology is Amaterasu.

Amaterasu, formally Amaterasu Ōmikami, is one of the central kami described in Japan’s earliest written chronicles, the Kojiki and Nihon Shoki. In the Kojiki, she is born when the creator deity Izanagi purifies himself and washes his left eye. Her siblings include Tsukuyomi, associated with the moon, and Susanoo, associated with storms and the sea.

Myths portray Amaterasu as ruler of Takamagahara, the heavenly realm. In the famous cave story, she hides in Ama-no-Iwato after a conflict with Susanoo, plunging the world into darkness. The other kami lure her out with music, dance, laughter, and a mirror. Her return restores sunlight.

Amaterasu is especially revered at Ise Jingū, where she is enshrined at the Inner Shrine. She is also presented in mythology as the ancestor of Japan’s imperial line through her grandson Ninigi. Tsukuyomi is a moon deity, while Susanoo is her storm-god brother—not alternative names for the sun goddess.