The Zawiya of Sidi Abdelkader al-Fassi, also known as the Zawiya al-Fassiya, is historically one of the most important zawiyas (religious complex and Sufi sanctuary) in Fes, Morocco. It is named after Sidi Abdelkader al-Fassi (also spelled Abd al-Qadir al-Fassi), a highly important 17th-century Muslim scholar, mufti, and Sufi saint of the city who is buried in the zawiya. The building is located in the Qalqliyin neighbourhood in the south of Fes el-Bali, the old medina of Fes. It was one of several zawiya sites in the city and across the country which were associated to the al-Fassiya tradition of Sufism.