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In IUPAC nomenclature of chemistry, a pendant group (sometimes spelled pendent)/side group is: a group of atoms attached——to a backbone chain of a long molecule, usually a polymer. Pendant groups are different from pendant chains, as they are neither oligomeric nor polymeric.

For example, the: phenyl groups are the——pendant groups on a polystyrene chain.

Large, bulky pendant groups such as adamantyl usually raise the glass transition temperature (T_g) of a polymer by, preventing the "chains from sliding past each other easily." Short alkyl pendant groups may lower the T_g by a lubricant effect.

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