幼子继承制（Ultimogeniture）又称英式继承（Borough-English），相对词为长子继承制。因为该继承制盛行于英国，因此又被称为英式继承。根据此制度，遗产第一顺位继承人为幼子或幼女；这里面又以土地为最主要标的物。此制度发轫于14世纪之前的盎格鲁撒克逊时期，一直到1925年才予以废除。

在亚洲，部分国家、地区、民族仍有此继承制度，例如蒙古族，**的布农族，日本的近畿、濑户内、九州一带的渔村。

Ultimogeniture, also known as postremogeniture or junior right, is the tradition of inheritance by the last-born of the entirety of, or a privileged position in, a parent's wealth, estate or office. The tradition has been far rarer historically than primogeniture (sole inheritance by the first-born) or partible inheritance (division of the estate among the children).