1,8-双二甲氨基萘（1,8-Bis(dimethylamino)naphthalene）俗称质子海绵（Proton Sponge，是Sigma-Aldrich的注册商标），是一种由萘衍生的有机化合物，最早是由 Roger Alder FRS在1968年于布里斯托大学制备。此化合物是由二个二甲基胺基接在萘的近位。

质子海绵有许多有趣的性质，包括其高碱性，以及其光谱特性。质子海绵是一种非亲核碱，拥有强碱性却不是良好的亲核体。

1,8-Bis(dimethylamino)naphthalene is a chemical compound that was first prepared in 1968 by Roger Alder FRS at the University of Bristol. It is often referred by the trade name Proton Sponge, a trademark of Sigma-Aldrich. This compound is a diamine in which the two dimethylamino groups are attached on the same side or peri position of a naphthalene system. Proton-sponge has several very interesting properties; one is its very high basicity; another is its spectroscopic properties.