n-Butylsodium CH3CH2CH2CH2Na is an organometallic compound with the idealized formula NaC4H9.

Like other simple organosodium compounds, it is polymeric and highly basic.

[2] In contrast to n-butyllithium, n-butylsodium is only of specialized academic interest.

[2] In n-Butylsodium, the Na-C bond has ionic character, with a negative charge on the end carbon atom.

[3] Soluble adducts are produced with Lewis bases such as tetramethylethylenediamine or tetrahydrofuran.