双子宫畸形（英语：Uterus didelphys, uterus didelphis），是一种罕见的妇科缺陷，指患者有两个完全分离的子宫，各自有独立的宫体、宫颈，附有各自的输卵管、卵巢、圆韧带、阔韧带等，是双侧副中肾管未融合的结果。

临床表现为月经持续时间长，有时有痛经。可有性生活不适。窥阴器检查可发现有两个阴道、两个宫颈，有时可触及两个子宫。超声波检查中可以看到横切宫颈有一椭圆形回声大于正常，内部有两条并列短光索，提示存在两个宫颈，宫体处有两个椭圆形宫体切面，回声相似、并列存在，呈现特异性的眼镜征。必要时用探针可探到两个宫腔。

Uterus didelphys (sometimes also uterus didelphis) represents a uterine malformation where the uterus is present as a paired organ when the embryogenetic fusion of the Müllerian ducts fails to occur. As a result, there is a double uterus with two separate cervices, and often a double vagina as well. Each uterus has a single horn linked to the ipsilateral fallopian tube that faces its ovary.