The elemental compositions of samples of limestone artifacts were determined by neutron activation analysis to investigate whether this technique could be used to distinguish objects made of limestone from different sources. Analysis was performed on aliquots weighing 40-100 mg. The following elements were determined quantities: Na, K, Rb, Cs, Ba, Sc, La, Ce, Sm, Eu, Hf, Th, Ta, Cr, Mn, Fe, Co, and Zn. The data on Egyptian limestone artifacts indicated that, because of the inhomogeneous nature of the stone, 0.2-2-g samples may not be representative of an entire object. Multivariate statistical methods produced a clear distinc-tion between objects originating from the Luxor area (ancient Thebes) and objects found north of Luxor. The Spanish limestone studied appeared to be more homogeneous. Samples from stylistically related objects had similar elemental compositions whereas relatively large differences were observed among objects having no relation other than the common provenance of medieval Spain. -- AATA