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The title compound, C 16 H 12 N 2 O 4 S, was obtained by the condensation of 3-acetyl-4-hy­droxy­coumarin with thien-2-ylcarbonyl hydrazide. The pyran ring adopts a 2,4-dione tautomeric form. The benzopyran ring system is almost coplanar with the thio­phene ring [dihedral angle 0.9 (2)°]. The exocyclic C=C double bond has an  E  geometry. The mol­ecular conformation is stabilized by an intra­molecular N—H⋯O hydrogen bond. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains along the  a  axis.

N′-[1-(2,4-Dioxo-3,4-dihydro-2H-1-benzopyran-3-ylidene)ethyl]thiophene-2-carbohydrazide