trustor  Entity that establishes a trust and place property under the protection and management of one or moretrustees for the immediate or eventual benefit of ascertainable one or more beneficiaries. It is not always necessary to identify the trustor who may be also be a trustee and/or one of the beneficiaries. In legal parlance, a trustor is called a settlor in the UK and a grantor in the US, whereas in common usage he or she may also be called a creator, donor, initiator, owner, or Trust maker.