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Crystals of N-acetylgalactosamine are monoclinic with unit-cell constants a=9.159 (4), b= 6.320 (2), c=9.208 (4) /~, ,8=107.88 (6) ° and space group P2~. The structure has been determined by direct methods and refined by least-squares calculations to a final R of 0.04. The main features of the molecular structure are the shortening of the anomeric bond in agreement with the observation on other saccharides, the electron delocalization of the amide group similar to that of N-acetylglucosamine and oligopeptides, and the existence of an intramolecular hydrogen bond.