Omo‘a (or Omoa) is the name of a small town and valley at the head of a bay by the same name, on Fatu Hiva.

Omo'a is located in Marquesas Islands
Location in the Marquesas Islands
Coordinates: 10°30′44″S 138°40′58″W / 10.51222°S 138.68278°W / -10.51222; -138.68278Coordinates: 10°30′44″S 138°40′58″W / 10.51222°S 138.68278°W / -10.51222; -138.68278
Country France
Overseas collectivity French Polynesia
Territory Marquesas Islands
IslandFatu Hiva
 • Total247

The bay of Omo‘a is the southernmost bay on the western coast of Fatu Hiva, and provides a good anchorage. The village of Omo‘a was home to 247 inhabitants at the 2002 census. The village is home to the island's only Protestant church. The valley of Omo‘a is well-watered, and curves in a half-moon shape, first to the southeast, and then to the northeast, terminating at the island's central plateau. This is where Thor Heyerdahl and his wife came ashore in 1937, an experience recorded in his book Fatu Hiva.