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The title compound, C13H15N5O, was synthesized by the reaction of 2-(1H-1,2,3-benzotriazol-1-yl)acetohydrazide with cyclopentanone. In the cyclopentane ring, two C atoms and their attached H atoms are disordered over two positions; the site occupancy factors are ca 0.63 and 0.37. In the crystal structure, molecules are linked into infinite chains directed along the b axis by N—H...O hydrogen bonds. In addition, there are weak C—H...O and C—H...N hydrogen bonds, as well as C—H...π-ring interactions in the structure.