Sodium naphthalene is an organic salt with the chemical formula Na+[C10H8]−.

In the research laboratory, it is used as a reductant in the synthesis of organic, organometallic, and inorganic chemistry.

Its deep green color arises from absorptions centered at 463 and 735 nm.

[5][6] With a reduction potential near −2.5 V vs NHE, the naphthalene radical anion is a strong reducing agent.

[7] The anion is strongly basic, and a typical degradation pathway involves reaction with water and related protic sources such as alcohols.