| Omo'a | |
| Settlement Type: | Town |
| Pushpin Map: | Marquesas Islands |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in the Marquesas Islands |
| Subdivision Type: | Country |
| Subdivision Name: |  France |
| Subdivision Type1: | Overseas collectivity |
| Subdivision Name1: |  French Polynesia |
| Subdivision Type2: | Territory |
| Subdivision Type3: | Island |
| Subdivision Name3: | Fatu Hiva |
| Population As Of: | 2002 |
| Population Total: | 247 |
| Coordinates: | -10.5122°N -138.6828°W |
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.
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.