"The Shadow Over Innsmouth" is a novella by H. P. Lovecraft. Written November-December 1931, the story was first published in April 1936; this was the only fiction of Lovecraft's published during his lifetime that did not appear in a periodical.

The story describes of a strange hybrid race, half-human and half an unknown creature that resembles a cross between a fish and frog, that dwells in the seaside village of Innsmouth (formerly a large town, but lately fallen into disrepair). The townspeople worship Cthulhu and Dagon, a Philistine deity incorporated into the Cthulhu Mythos.