Trees has more than one meaning:

• Trees (poem), a poem by Joyce Kilmer
• TreePeople, an environmental nonprofit based in Los Angeles
• Slang for cannabis
• Trees (song), a song by Marty Casey & Lovehammers (Sometimes just Lovehammers)
• Trees (band), an American one-man band.
• Trees (folk band), a British folk rock band of the 1970s particularly famous for The Garden of Jane Delawney.
• In computer science, a tree data structure is a widely-used computer data structure that emulates a tree structure with a set of linked nodes.

For further meanings, see Tree (disambiguation).