Abstract: The biologically active N,N'-di(2-hydroxybenzylidene)hydrazine has been synthesized and specifically characterized by X-ray crystallography. There are two molecules of N,N'-di(2-hydroxybenzylidene)hydrazine, C14H12N2O2, in the unit cell. The N,N'-di(2-hydroxy benzylidene)hydrazine molecule is planar, with maximum deviation from the mean plane being less than 0.028(2) Å. Intramolecular O-H···N hydrogen bonding interactions were observed in the crystal lattice which connected the molecules into chain running along b-axis.