A trust may have multiple trustees, and these trustees are the legal owners of the trust's property, but have a fiduciary duty to beneficiaries and various duties, such as a duty of care and a duty to inform. If trustees do not adhere to these duties, they may be removed through a legal action. The trustee may be either a person or a legal entity such as a company, but typically the trust itself is not a legal entity and any litigation involving the trust must include the trustee as a party. A trustee has many rights and responsibilities which vary based on the jurisdiction and trust instrument. If a trust lacks a trustee, a court may appoint a trustee.

The trustees administer the affairs attendant to the trust. The trust's affairs may include prudently investing the assets of the trust, accounting for and reporting periodically to the beneficiaries, filing required tax returns and other duties. In some cases dependent upon the trust instrument, the trustees must make discretionary decisions as to whether beneficiaries should receive trust assets for their benefit. A trustee may be held personally liable for problems, although fiduciary liability insurance similar to directors and officers liability insurance can be purchased. For example, a trustee could be liable if assets are not properly invested. In addition, a trustee may be liable to its beneficiaries even where the trust has made a profit but consent has not been given. However, in the United States, similar to directors and officers, an exculpatory clause may minimize liability; although this was previously held to be against public policy, this position has changed.

In the United States, the Uniform Trust Code provides for reasonable compensation and reimbursement for trustees subject to review by courts, although trustees may be unpaid. Commercial banks acting as trustees typically charge about 1% of assets under management.

Beneficiaries.

The beneficiaries are beneficial (or 'equitable') owners of the trust property. Either immediately or eventually, the beneficiaries will receive income from the trust property, or they will receive the property itself. The extent of a beneficiary's interest depends on the wording of the trust document. One beneficiary may be entitled to income (for example, interest from a bank account), whereas another may be entitled to the entirety of the trust property when they attain the age of twenty-five years. The settlor has much discretion when creating the trust, subject to some limitations imposed by law.

The use of trusts as a means to inherit substantial wealth may be associated with some negative connotations; some beneficiaries who are able to live comfortably from trust proceeds without having to work a job may be jokingly referred to as "trust fund babies" (regardless of age) or "trustafarians"