In enzymology, a P-type Na<sup>+</sup> transporter () is an enzyme that catalyzes the chemical reaction
The 3 substrates of this enzyme are ATP, H<sub>2</sub>O, and Na<sup>+</sup>, whereas its 3 products are ADP, phosphate, and Na<sup>+</sup>.
This enzyme belongs to the family of translocases, specifically those catalysing the translocation of inorganic cations and their chelates. The systematic name of this enzyme class is ATP phosphohydrolase (P-type, Na<sup>+</sup>-exporting).