Sodium diacetate is a compound with formula NaH(C2H3O2)2.

It is a colorless solid that is used in seasonings and as an antimicrobial agent.

The salt forms upon half-neutralization of acetic acid followed by evaporation of the solution.

[2] The species has no significant existence in solution but forms stable crystals.

As a food additive,[3] it has E number E262 and is used to impart a salt and vinegar flavor.