Sodium orthovanadate is the inorganic compound with the chemical formula Na3V O4.

[2] Sodium orthovanadate is produced by dissolving vanadium(V) oxide in a solution of sodium hydroxide: The salt features tetrahedral VO3−4 anion centers linked to octahedral Na+ cation sites.

[3] Like many oxometalates, orthovanadate is subject to a number of reactions, which have been analyzed by 51V NMR studies.

[5] Vanadates exhibit a variety of biological activities, in part because they serve as structural mimics of phosphates.

[6][7] It acts as a competitive inhibitor of ATPases, alkaline and acid phosphatases, and protein-phosphotyrosine phosphatases,[8] and its inhibitory effects can be reversed by dilution or the addition of ethylenediaminetetraacetic acid (EDTA).