A tree is a woody plant. Tree may also refer to:
- Tree structure, a way of representing the hierarchical nature of a structure in a graphical form
- Tree (data structure), a widely-used computer data structure that emulates a tree structure with a set of linked nodes
- Tree (graph theory), a graph in which any two vertices are connected by exactly one path
- Tree (descriptive set theory), a set of finite sequences of elements of X that is closed under subsequences, on a set X
- Tree (set theory), a partially ordered set (poset) (T, <) such that for each t ∈ T, the set {s ∈ T : s < t} is well-ordered by the relation <
- Tree (Unix), a recursive directory listing program that produces a depth indented listing of files
- Tree (DOS), a recursive directory listing command that produces a depth indented listing of files
- In linguistic syntax, a structure used to describe sentence structure
- Shoe tree, a device for storing shoes
- World Tree, a motif present in several Indo-European religions
- Mesoamerican world tree, a mythical and cosmological conception among pre-Columbian Mesoamerican cultures
- Stanford Tree, Stanford University's unofficial mascot
- Slang for cannabis
- Tree, the wooden understructure of a horse's saddle
- TREE, Trends in ecology and evolution a scientific journal
- Herbert Tree (actor) was a British actor of the late 1800s
- A nickname for those who are the third of their name, similar to the use of the name Trey
Trees may refer to:
- Trees (film), a 1999 direct to video horror film
- "Trees" (poem), a poem by Joyce Kilmer
- Trees (folk band), British folk band
- Trees (band), one-man new wave band
- "Trees" (song), a song by Lovehammers
- Trees is a slang for cannabis
- The Trees (novel), a novel by Conrad Richter
- The Trees, a song on Rush's 1978 album Hemisphere
- "The Trees" (Autechre song), a song by Autechre
- TreePeople, a nonprofit environmental group based in Los Angeles
- Tree63, a Christian rock band
- "The Trees" (song), a song by British pop band Pulp
Treeing may refer to:
- Treeing, a method of hunting
- Electrical treeing, a process whereby branching channels, or chains of small fractures, are created within, or on the surface of, a solid dielectric material
- Tree River, a Canadian river
