林格氏液(Ringer's Solution)也称复方氯化钠注射液，比生理盐水成分完全，可代替生理盐水用，它是由英国生理学家“林格”所发明，所以称林格氏液。
林格氏液内含氯化钠0.85%、氯化钾0.03%、氯化钙0.033%，渗透压为308osm/l，是一种等渗溶液，可以在眼科白内障手术中作为灌注液使用，为了使用手术中减少并发症，临床上也有很多改良后的林格氏液。
在林格氏溶液的基础上再加入乳酸钠，则成为乳酸钠林格注射液，也称哈特曼氏溶液。
Ringer's solution is named after Sydney Ringer, who in 1882–1885 determined that a solution perfusing a frog's heart must contain sodium, potassium and calcium salts in a definite proportion if the heart is to be kept beating for long.
Ringer's solution is a solution of several salts dissolved in water for the purpose of creating an isotonic solution relative to the body fluids of an animal. Ringer's solution typically contains sodium chloride, potassium chloride, calcium chloride and sodium bicarbonate, with the last used to balance the pH. Other additions can include chemical fuel sources for cells, including ATP and dextrose, as well as antibiotics and antifungals.
