Manitoba maple (Acer negundo), also known as Ash-leaved maple or (confusingly!) Box-elder, is a species of maple, which occurs throughout most of North America. It is a small tree that grows up to 10-20m tall. Unlike most other maples (which usually have palmate leaves), it has pinnate leaves with 3, 5 or 7 leaflets, resembling an Ash or an Elder, hence the two alternative common names.

A few botanists treat it in its own distinct genus, as Negundo aceroides, but this is not widely followed.

There are two subspecies: