天棓四 ( γ Dra /天龙座γ) 是天龙座内的恒星，他传统的英文名字是Eltanin (或 Etamin)。

天棓四是一颗橘色的巨星，恒星光谱为K5，距离地球148光年。虽然拜耳序号为γ，但却是天龙座内最亮的恒星，比天棓三 (天龙座β)还亮大约半个星等。事实上，天棓三的英文Rastaban比Eltanin更早就被使用了，而这两个字都源自阿拉伯文，字根的意思分别是龙或蛇。在伦敦，这颗星的位置就在头顶正上方附近，因此赢得了天顶之星的名称。

在150万年前，天棓四曾经在28光年的距离内经过地球附近，当时他的亮度超越天狼星，是天空中最亮的恒星。

Gamma Draconis (γ Dra, γ Draconis) is the Bayer designation for a star in the northern constellation of Draco. It has the traditional name Etamin, Eltanin or Ettanin and the Flamsteed designation 33 Draconis. Despite its gamma designation, it is actually the brightest star in Draco at magnitude 2.4, outshining Rastaban (Beta Draconis) by nearly half a magnitude. Its proximity to the zenith point directly overhead of London has earned it the name "Zenith Star." As for other places, it is relatively easy to locate in the night sky. If one finds Vega, Eltanin is the red star just north-northwest of it.