拜耳命名法（Bayer designation）是一种恒星命名法，它以一个希腊字母做前导，后面伴随着拉丁文所有格的星座名称。拜耳命名的原始清单载有的恒星共有1,564颗。

德国天文学家约翰·拜耳于1603年在他的星图《测天图》（Uranometria）中，首先有系统的为许多亮星命名。拜耳在他的星图上，使用小写的希腊字母，像是α、β、γ、等等为前导，分配给星座中的每一颗星，再与恒星所在星座的拉丁文所有格结合，组成恒星的名字（参见所有格的星座列表，在中文则是字母跟随在星座名称之后）。例如，毕宿五命名为金牛座α，它的意思就是在金牛座排序为第一颗的恒星。

A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars.

Most of the brighter stars were assigned their first systematic names by the German astronomer Johann Bayer in 1603, in his star atlas Uranometria. Bayer assigned a lower-case Greek letter, such as alpha (α), beta (β), gamma (γ), etc., to each star he catalogued, combined with the Latin name of the star’s parent constellation in genitive (possessive) form. (See 88 modern constellations for the genitive forms.) For example, Aldebaran is designated α Tauri (pronounced Alpha Tauri), which means "Alpha of the constellation Taurus".