Acer negundo is a species of maple native to North America. Box elder, boxelder maple, ash-leaved maple, and maple ash are among its common names in the United States; in Canada it is commonly known as Manitoba maple and occasionally as elf maple; in the United Kingdom and Ireland it is known as ashleaf maple.
Box elder is a fast-growing, short-lived tree with opposite, compound leaves. It is sometimes considered a weedy or invasive species. It has been introduced to and naturalized on most other continents, including in South America, Australia, New Zealand, South Africa, much of Europe, and parts of Asia.