Polyamide-11 (PA11)/organoclay nanocomposites were prepared via melt compounding using silane grafted montmorillonites and Cloisite 20A. Two graft procedures were used for clay modification. The first one provided a grafted 3-aminopropyltriethoxysilane (APTES) at clay surfaces, whereas the second led to intercalated structure in addition to grafted APTES at clay surface. X-ray diffraction and transmission electron microscopy confirmed the formation of the exfoliated nanocomposites at low clay loading (2 wt. %) and a mixture of exfoliated and intercalated structures at higher clay contents. Thermogravimetric analysis, melt rheology as well as tensile tests showed that the degree of dispersion of clay within polymer matrix plays a vital role in property improvement. In addition, elongation at break was considerably enhanced in the case of silane grafted clay. This was attributed to hydrogen bonding between clay surfaces and PA11 via APTES.