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In the title isatin derivative, C11H6ClNO2, the indoline ring is planar (r.m.s. deviation = 0.009 Å), with the two ketone O atoms lying in the plane and the chlorine atom displaced by 0.036 (1) Å. The dihedral angle between the mean plane of the indoline ring system with that of the propynyl chain is 73 (8)°. In the crystal, molecules are linked by C—H...O hydrogen bonds, forming zigzag chains propagating along the b-axis direction. The chains are linked via weak π–π interactions [inter-centroid distance = 3.728 (1) Å], forming slabs parallel to the bc plane.