Middlesex Defense Attorneys, Inc. (MDA) is a non-profit organization that administers criminal defense services for indigents accused of crimes in Middlesex County.

MDA manages a panel of nearly 300 private attorneys who handle 90% of criminal defense cases for indigent clients in Middlesex County. MDA manages this program for the Committee for Public Counsel Services, the state agency that oversees indigent criminal defense in the Commonwealth of Massachusetts.