We describe a fast, simple, and effective synthesis of N-acylhydrazones via a solid-state melt reaction under catalyst-and solvent-free conditions. The reactions of 2-furoic hydrazide, 2-thiophenecarboxylic acid hydrazide and substituted alkyl/aryl-acylhydrazides with aromatic aldehydes proceeded well at 120 °C in only 30 min to give the corresponding products in good to excellent isolated yields (74-100%) without purification using column chromatography. Gram scale experiments also worked well. This method could be considered as a green procedure, which has a high atom economy (94.69-94.90%), high reaction mass efficiency (84.27-87.33%), low E-factor (0.15-0.19 g/g), and low process mass intensity (13.21-14.30 g/g).