The Willows airships were a series of pioneering non-rigid airships designed and built in Wales by Ernest Thompson Willows in the first decade of the 20th century. The first airship Willows No. 1 flew in 1905, and the last, the Willows No. 5 in 1913.

A blimp (/blɪmp/), or non-rigid airship, is an airship (dirigible) without an internal structural framework or a keel. Unlike semi-rigid and rigid airships, blimps rely on the pressure of the lifting gas inside the envelope and the strength of the envelope itself to maintain their shape. Blimps are known for their use in advertising, surveillance, and as observation platforms due to their maneuverability and steady flight capabilities.