The title compound, C(16)H(13)ClFNOS, possesses potent anti-bacterial activity. The overall mol-ecular conformation is described by the dihedral angles of 43.0 (1)° between the 3-chloro-4-methyl-benzene and thia-zolidinone rings, and 88.8 (5)° between the thia-zolidinone and 4-fluoro-benzene rings. The 3-chloro-4-methyl-benzene ring is disordered over two positions with occupancy factors approximately 3:1.