鸡母珠（学名：Abrus precatorius），又名相思豆、美人豆、亦被称作红豆，是豆科相思子属的一种有毒植物，泛热带分布。

木质藤本；偶数羽状复叶，长椭圆形小叶8－15对；春夏开花，花为总状花序顶生或腋生，蝶形花冠，淡紫红色或偶然白色，花期为九月；长椭圆形荚果密生细毛，广卵形种子颜色鲜艳美丽，上端朱红色，下端三分之一为黑色，外观跟瓢虫的颜色很像。

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Abrus precatorius, known commonly as jequirity, Crab's eye, or crab's eye creeper, cock's eyes, rosary pea, paternoster pea, love pea, precatory pea or bean, prayer bead, John Crow Bead, coral bead, red-bead vine, country licorice, Indian licorice, wild licorice, Jamaica wild licorice, Akar Saga, coondrimany, gidee gidee, Jumbie bead ratti/rettee/retty, or weather plant, is a slender, perennial climber that twines around trees, shrubs, and hedges. It is a legume with long, pinnate-leafleted leaves.