牧夫座λ (λ Boo / λ Boötis),中文名称为元戈或玄戈,是在牧夫座的一颗恒星。
牧夫座λ是一颗白色的A型主序矮星,视星等 +4.18,与地球的距离大约是97.1光年。牧夫座λ是一种已知但罕见、被称为牧夫座λ型星的原型,这些恒星都是光谱呈现金属丰度异常低的矮星。他的直径经过直接测量是太阳的1.7倍[1]。
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