| Official Name: | Vaiusu |
| Settlement Type: | Village |
| Pushpin Map: | Samoa |
| Subdivision Type: | Country |
| Subdivision Name: |  Samoa |
| Subdivision Type1: | District |
| Subdivision Name1: | Tuamasaga |
| Population As Of: | 2016 |
| Population Total: | 2686 |
| Timezone: | -11 |
| Coordinates: | -13.8306°N -171.7986°W |
Vaiusu is a village on the Samoan island of Upolu. It is located on the central-north coast of the island, to the west of the capital Apia. As of 2016, Vaiusu had a population of 2,686.[1]
In 2019 the government proposed a US$100 million wharf and port project for Vaiusu, to be funded by a loan from China.[2] Following the 2021 Samoan general election newly elected Prime Minister Fiamē Naomi Mataʻafa formally scrapped the project.[3]
The majority of the community adhere to the Catholic Church. There are also members of Islam, with a mosque located along the main road in Vaiusu-Tai[4] and members of Assembly Of God (AOG) in Vaiusu-Uta.