分子间作用力（Intermolecular force），亦称分子间引力，指存在于分子与分子之间或高分子化合物分子内官能基之间的作用力，简称分子间力。它主要包括：

此外，新型的分子间作用力也不断有报道，包括双氢键和金键等。

Intermolecular forces (IMFs) are forces of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions). They are weak compared to the intramolecular forces, the forces which keep a molecule together. For example the covalent bond, involving the sharing of electron pairs between atoms is much stronger than the forces present between the neighboring molecules. They are an essential part of force fields frequently used in molecular mechanics.