Sultan Thuwaini bin Said al-Said (Sayyid Thuwaynī bin Sa‘id al-Sa‘id) (1821–1866) also called Tueni, Sultan of Muscat and Oman (October 19, 1856 – February 11, 1866), is the third son of Said bin Sultan, Sultan of Muscat and Oman.

Thuwaini was born in Oman, and never visits Zanzibar.

When his father is away on Zanzibar, Thuwaini is his representative in Oman.