Which Titan remained neutral during the Titanomachy?

Oceanus was the Titan who remained neutral during the Titanomachy.

Oceanus was one of the twelve Titans, born to Uranus and Gaia, but he did not join Cronus and the other Titans in their war against Zeus and the Olympians. Instead, he remained apart from the main conflict. His neutrality is especially associated with accounts in which Oceanus avoids the Titans’ rebellion and survives the war without being imprisoned.

Oceanus personified the enormous river believed to encircle the world. He was married to Tethys, and together they were regarded as the parents of river gods and Oceanids. Because he represented a cosmic boundary and a primordial waterway, his role differs from that of the warrior Titans directly aligned with Cronus.

Oceanus was not entirely uninvolved with the Olympian side. Hesiod says that his daughter Styx went to Zeus with her children, including Nike, Zelus, Kratos, and Bia, and they fought for him. That family connection can cause confusion, but the Titan himself is conventionally identified as the neutral Titan.