In the title complex, [Co(C(16)H(12)N(3)S)(3)]·4H(2)O, the central Co(III) atom is in a distorted octa-hedral coordination environment. There are three N-[(anthracen-9-yl)-methyl-ene-amino]-thio-ureate ligands coordinated to the Co(III) atom via three imine N and three thio-amide S atoms. The Co-S and Co-N bond distances are in expected ranges [2.2194 (8)-2.2545 (8) and 1.926 (2)-1.985 (2)Å, respectively]. The endocyclic S-Co-N bond angles in the five-membered chelate rings range from 82.91 (7) to 85.33 (7)°. The structure contains four water mol-ecules which are disordered over 12 sites and link the complex mol-ecules into a three-dimensional network through N-H⋯O, O-H⋯O, O-H⋯N, and O-H⋯S hydrogen bonds.