In the title mol-ecule, C(18)H(20)F(2)N(2)O(2)S, the 2,6-difluoro-4-hy-droxy-phenyl ring and the carbonyl-thio-urea group are each essentially planar, with maximum deviations of atoms from their mean planes of 0.0113 (14) and 0.1017 (15) Å, respectively; the dihedral angle between these two planes is 71.03 (6)°. An intra-molecular N-H⋯O hydrogen bond occurs. In the crystal, N-H⋯O and O-H⋯S hydrogen bonds connect the mol-ecules into chains running diagonally across the bc plane. C-H⋯S and C-H⋯F contacts are also observed.