Potassium propanoate or potassium propionate is a chemical compound with the chemical formula K(C<sub>2</sub>H<sub>5</sub>COO). It is the potassium salt of propanoic acid.
Potassium propanoate can be prepared by treating potassium carbonate with propanoic acid.
It is used as a food preservative and is represented by the food labeling E number E283 in Europe and by the INS number 283 in Australia and New Zealand.
Decomposition takes place via ketonization, yielding the symmetric ketone and potassium carbonate: