The Ohnes, also known as Oannes are a semi-aquatic species found on Oannes in the Milky Way galaxy.

In addition to breathing in the ocean, they can comfortably breathe on land, though it is possible they are more dependent on water breathing than air breathing. They have shown themselves to oppose the Goa'uld. One of their own, Omoroca, went to Earth to help foster a rebellion against Ra, though she was ultimately killed by Belus. Her mate, Nem, spent four thousand years alone before he discovered her fate.

The race have a lifespan that lasts 5,000 years and their young reach maturity by the age of 200. Their society is divided into castes; the two primary ones being the Warrior caste and the Scholar caste though several lower castes do exist.