An owner: a person or entity that formally possesses property or assets and holds ownership rights.
この土地の所有者は誰ですか？
Who is the owner of this land?
所有者の許可なく建物を改造してはいけない。
You must not modify the building without the owner's permission.
契約書には所有者の署名が必要だ。
The owner's signature is required on the contract.