High Quality Content by WIKIPEDIA articles! A fiduciary duty is a legal or ethical relationship of confidence or trust between two or more parties, most commonly a fiduciary or trustee and a principal or beneficiary. One party, for example a corporate trust company or the trust department of a bank, holds a fiduciary relation or acts in a fiduciary capacity to another, such as one whose funds are entrusted to it for investment. In a fiduciary relation one person justifiably reposes confidence, good faith, reliance and trust in another whose aid, advice or protection is sought in some matter. In such a relation good conscience requires one to act at all times for the sole benefit and interests of another, with loyalty to those interests.