Thiès ([tjɛs]; Arabic: ثيس, romanized: Ṯyass; Noon: Chess) is the third largest city in Senegal with a population of 391,253 in 2023.

Before colonization, the Thiès Plateau was a wooded frontier between the kingdoms of Cayor and Baol inhabited by the Serer-Noon, an ethnic sub-group of the Serer people.

The Spiritans founded a mission there in the late 19th century to help protect the local population from raids out of Mauretania seeking to capture slaves.

The railways brought commercial development and migrant laborers, including Bambara from eastern regions of Senegal and from Mali.

Thiès is best known for its tapestry-making industry, an exclusive factory having been set up in 1966, producing work designed by Senegal's top artists.

[2] Thiès is the transportation hub of a productive agricultural hinterland, producing rice, peanuts, manioc, millet, and fruit.