In biology, galvanism is the contraction of a muscle that is stimulated by an electric current. In physics and chemistry, it is the induction of electrical current from a chemical reaction, typically between two chemicals with differing electronegativities.

The effect was named after the scientist Luigi Galvani, who investigated the effect of electricity on dissected animals in the 1780s and 1790s. When Galvani was doing some dissection work in his lab, his scalpel touched the body of a frog, and he saw the muscles in the frog's leg twitch. Galvani referred to the phenomenon as animal electricity, believing that he had discovered a distinct form of electricity.

The modern study of galvanic effects in biology is called electrophysiology, the term galvanism being used only in historical contexts. The term is also used to describe the bringing to life of organisms using electricity, as popularly associated with (but never explicitly depicted in) Mary Shelley's work Frankenstein, and people still speak of being 'galvanized into action'.