斑蝶亚科（Milkweed butterfly，学名：Danainae）是蛱蝶科中的一个亚科。牠们将卵产在马利筋属的植物上，以供幼虫诞生后食用。

一般为黄色、红色、黑色、灰色或白色，有的有闪光；头大、触角细；前足退化，折叠在胸下，没有爪；翅膀的外缘为圆形或波状，中室长而封闭；前翅径脉5条，后翅肩脉发达，没有尾突。雄蝶前翅肘脉上或后翅臀区有香鳞；幼虫体上多皱纹，胸、腹部各有1～2对长线状突起，能散发臭气御敌。

Milkweed butterflies are a subfamily, Danainae, in the family Nymphalidae, or brush-footed butterflies. They lay their eggs on various milkweeds on which their larvae (caterpillars) feed. Historically, this group had been considered a separate family, Danaidae.