阿尔弗雷德·卡斯特勒（法语：Alfred Kastler，1902年5月3日法国盖布维莱尔 - 1984年1月7日），法国物理学家，1966年获诺贝尔物理学奖。

Alfred Kastler (3 May 1902 – 7 January 1984) was a French physicist, and Nobel Prize laureate.

Kastler was born in Guebwiller (Alsace, German Empire) and later attended the Lycée Bartholdi in Colmar, Alsace, and École Normale Supérieure in Paris in 1921. After his studies, in 1926 he began teaching physics at the Lycée of Mulhouse, and then taught at the University of Bordeaux, where he was a university professor until 1941. Georges Bruhat asked him to come back to the École Normale Supérieure, where he finally obtained a chair in 1952.