Abraham (Al) Weiss, 68, a retired assistant secretary of labor and a former official of the International Brotherhood of Teamsters, died Saturday at Suburban Hospital in Bethesda following a heart attack.

In 1954, Mr. Weiss became chief economist and director of research of the Teamsters union. He held that post until 1974, when he was appointed assistant secretary of labor for policy evaluation and research.He retired in 1977 and since then had been a consultant in industrial relations and an arbitrator for the American Arbitration Association, the Federal Mediation and Conciliation Service, the National Mediation Board and other organizations.

Mr. Weiss, who was born in New York City, graduated from Brooklyn College. In the early 1930s, he taught French in the New York public schools and studied Romance philology at Columbia University.

In 1936, having taken a Civil Service examination, he moved to Washington and worked briefly for the Veterans Administration. He then joined the Bureau of Labor Statistics in the Department of Labor and embarked on a career in labor relations. In 1945, he earned a master's degree in economics at Georgetown University.

In 1950, when he was head of industrial relations research at the BLS, he took a leave of absence from the government to help negotiate health, welfare and pension contracts for the United Steel Workers of America. After the outbreak of the Korean conflict in 1950, he was named director of the office of economic analysis for the Wage Stabilization Board and remained there until 1954. He was co-author of the board's official history.

Mr. Weiss then began his career with the Teamsters.

Mr. Weiss, who lived in Bethesda, was a member of the Industrial Relations Research Association, the Federal Advisory Council on Employment Insurance, the White House Conference on the Industrial World Ahead and several other professional groups. He received a meritorious service certificate from the Labor Department.

He also was a member and former vice president of Congregation Beth El in Bethesda and was active in folk dancing groups.

Mr. Weiss is survived by his wife, Majory of Bethesda, and two chidlren, Marc of New York City and Carol Rosenberg of South Bend, Ind., three sisters in New York and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to a charity of one's choice.