Riggs National Bank has named six new members to its board of directors, effective Jan. 9.

The new directors are: Robert M. Haft, president of Dart Group Corp., Crown Books Corp. and Trak Auto Corp.; John J. Kirlin, founder and chairman of John J. Kirlin Inc., a Rockville mechanical contracting firm; Francis J. Lyons, executive vice president of Riggs Bank and head of its trust department; John A. Sargent, vice president and director of the Washington office of the commercial real estate firm of Randall H. Hagner & Co. Inc.; James W. Symington, partner in the Washington law firm of Smathers, Symington and Herlong and a former four-term Congressman from Missouri; and the Right Rev. John T. Walker, sixth bishop of the Episcopal Diocese of Washington and dean of Washington Cathedral.

Joseph L. Allbritton, chairman and chief executive officer of Washington's largest bank, said the new directors will bring Riggs "specialized talents and experience that will contribute significantly to our policies of continued growth and expanded banking services."

Haft, 32, who holds degrees in business and city planning from Harvard University and in economics from the University of Pennsylvania's Wharton School of Finance and Commerce, sits on Riggs' advisory board. He is also a member of of the Young Presidents Associaition and the American Booksellers Association.

Kirlin, 58, is a principal in a number of firms besides his Rockville company, including Kirlin Enterprises Inc., Combustioneer Corp., Asbestos Abatement Services Inc., Inscho-Kirlin of Florida Inc. and Warner Mechanical Inc. Born in Philadelphia and raised in the District, he attended George Washington Univesity. He is a member of the Mechanical Contractors Association and the Washington Building Congress.

Lyons, 63, joined Riggs' trust department in 1950, becoming a vice president in 1966, senior vice president in 1972 and executive vice president in 1977. He holds a law degree from Georgetown University, and is a member of the bar in Virginia and the District.

Sargent, 40, served for two years with the Peace Corps. following his graduation from Boston University in 1968. He was vice president and marketing director of Freedom Federal Savings and Loan Association of Worcester, Mass., for four years before joining Hagner. He is president-elect for 1985 of the Mortgage Bankers Associaition of Metropolitan Washington.

Symington, 57, had a long career in government before his stint in Congress, including posts as U.S. chief of protocol from 1966 to 1968, administrative assistant to then-attorney general Robert F. Kennedy, and attache' to the U.S. embassy in London from 1958 to 1960.

Walker, 59, a native of Barnesville, Ga., in 1951 became the first black student to be enrolled at Virginia Theological Seminary. He was assigned to Washington as a canon of the Washington Cathedral in 1966, and became the diocese's sixth bishop in 1977. He was the first president of the Interfaith Conference of Metropolitan Washington and first chairman of the Urban Bishops Coalition. He is currently president of the Council of Churches of Greater Washington.