The polymorphism of poly(vinylidene fluoride) (PVDF) and its nanocomposites was studied by means of solid state nuclear magnetic resonance spectroscopy. C-13 cross polarization magic angle spinning (C-13 CP MAS) NMR spectra were recorded using simultaneous high-power decoupling on both the proton and fluorine channels. Both H-1 --> C-13 and F-19 --> C-13 CP experiments were conducted, giving identical results apart from intensity variations due to the CP efficiency. Two main resonances for the CF2 and the CH2 groups were observed for both neat PVDF (PVDF-CO) and the nanocomposite containing 2 wt% clay (PVDF-C2) samples. F-19 CP MAS spectra were obtained from long proton spin-lock experiments with a shorter contact time. The results showed two strong resonances at -84 and -98 ppm with equal intensities, representing the alpha-form crystalline structure of PVDF. It was shown that the clay induces the crystallization of PVDF in beta-form. Our earlier investigations using thermal analysis and X-ray scattering methods also showed crystal transformation of PVDF in its clay nanocomposites.