柠檬酸钠（sodium citrate），又称枸橼酸钠，是一种有机酸钠盐。外观为白色到无色晶体，有肥皂水的味道。

柠檬酸钠可由柠檬酸和氢氧化钠酸碱中和或与碳酸钠或碳酸氢钠发生复分解反应而制得。

Trisodium citrate has the chemical formula of Na₃C₆H₅O₇. It is sometimes referred to simply as sodium citrate, though sodium citrate can refer to any of the three sodium salts of citric acid. It possesses a saline, mildly tart flavor. It is mildly basic and can be used along with citric acid to make biologically compatible buffers.