Sheikh Saad Buh (Arabic: الشيخ سعد بوه) was a Moorish, Qadiriyyah, Fadiliyya Sufi from Mauritania.
Buh, who settled in Trarza in the 1870s, developed a following in St. Louis, and began a pattern of visits to the peanut basin and river valley.
In the late 1860s, before he was 20, Buh established ties with the French administration who were at the time trying to conquer the Senegalo-Mauritanian zone, and became involved in a network of teachers, schools and zawiyas (lodges) across the Sahel and Sahara.
Buh several times saved French explorers from local bands.
In 1910, he wrote a letter of counsel, which became famous, to his brother Ma al-'Aynayn urging him not to wage war on the French, saying that French stability had allowed Islam to spread and acquire stability in the region.