Antimonides (sometimes called stibnides) are compounds of antimony with more electropositive elements. The antimonide ion is Sb³⁻. Reduction of antimony by alkali metals or by other methods leads to alkali metal antimonides of various types. Known antimonides include isolated Sb³⁻ ions (in Li₃Sb, Na₃Sb), dumbbells Sb₂⁴⁻ in Cs₄Sb₂, discrete antimony chains, for example, Sb₆⁸⁻ in SrSb₃, infinite spirals (Sb⁻)_n (in NaSb, RbSb), planar four-membered rings Sb₄²⁻, Sb₇³⁻ cages in Cs3Sb, and net shaped anions Sb₃²⁻ in BaSb₃. Some antimonides are semiconductors, e.g. those of the boron group such as indium antimonide. Many antimonides are flammable or decomposed by oxygen when heated since the antimonide ion is a reducing agent.

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