低白蛋白血症(Hypoalbuminemia、或低人血清白蛋白血症(hypoalbuminaemia))是一种医学病症，其中在血清的白蛋白(Human serum albumin)的水平异常的低。它是低蛋白血症(Hypoproteinemia)的一种具体形式。.

白蛋白是在人体内的主要蛋白，占大约总人体血浆蛋白质质量的55-60％。许多激素、药物，和其它分子在血液中大多是结合到白蛋白里，并在转为"生物活性"(biologically active)之前必须被释放。例如，钙离子结合于白蛋白、且"低白蛋白血症"导致增加游离的钙离子。

Hypoalbuminemia (or hypoalbuminaemia) is a medical condition where blood levels of albumin are abnormally low. It is a type of hypoproteinemia.

Albumin is a major protein in the human body, making up about 55-60% of total human plasma protein by mass. Many hormones, drugs, and other molecules are mostly bound to albumin in the bloodstream and must be released before becoming biologically active. For example, calcium binds to albumin and hypoalbuminemia leads to an increase in free ionized calcium.