BlackRock MuniYield Quality Fund III, Inc. is a closed ended fixed income mutual fund launched by BlackRock, Inc. It is managed by BlackRock Advisors, LLC. The fund invests in fixed income markets. It invests primarily in a portfolio of long-term investment-grade municipal obligations exempt from federal income taxes. BlackRock MuniYield Quality Fund III, Inc. was formed in April 13, 1992 and is domiciled in United States.