Four new (A_{x} \mathrm{NbS}{2}) phases, where (A=\mathrm{Cs}, x=0.34,0.60 ; A=\mathrm{Rb}, x=0.33,0.6), were prepared from (\mathrm{Nb}) and (A{2} \mathrm{CO}{3}), in a (\mathrm{CS}{2} / \mathrm{Ar}) atmosphere at (700^{\circ} \mathrm{C}). The compounds were refined (Rietveld profile analysis) in (P 6_{3} / \mathrm{mmc}) symmetry. Crystal data were (\mathrm{Cs}{0.34} \mathrm{NbS}{2}, a=3.3452(5) \AA, c=18.424(5) \AA); (\mathrm{Cs}{0.00} \mathrm{NbS}{2}, a=3.3539(6) \AA, c=18.324(1) \AA ; \mathrm{Rb}{0.33} \mathrm{NbS}{2}, a=3.3425(5) \AA, c=18.075(2) \AA ; \mathrm{Rb}{0.6} \mathrm{NbS}{2}), (a=3.3462(3) \AA, c=17.986(2) \AA). The compounds comprise a (2 \mathrm{H}) - (\mathrm{NbS}), host with trigonal prismatic (\mathrm{Nb}) ions and alkali ions intercalated in trigonally distorted octahedral holes between (\mathrm{NbS}{2}) layers. Increasing the alkali content effects a decrease in the (c) lattice parameters due to decreases in interlayer (\mathrm{S} \cdots \mathrm{S}) separations. Magnetic susceptibility and resistivity measurements indicate metallic behavior for all compounds below room temperature. The (\mathrm{Cs}) phases are bulk type II superconductors (\left(\mathrm{Cs}{0.34} \mathrm{NbS}{2}\right.), (T{\mathrm{c}}=3.0 \mathrm{~K}, \mathrm{Cs}{0.60} \mathrm{NbS}{2}, T_{\mathrm{c}}=2.0 \mathrm{~K}) ). (1993 Academic Press. Inc.