Norman S. Halliday, 55, a lawyer and a former assistant postmaster general for government relations in the U.S. Postal Service, died of cancer Jan. 27 at the National Cancer Institute in Bethesda.

Mr. Halliday, who lived in Alexandria, was born in Boston and reared in Quincy, Ill. After World War II Navy service, he earned a bachelor's degree at Washington University in St. Louis and a law degree at St. Louis University. He worked in labor relations in St. Louis and Boise, Idaho, before moving to Washington in 1963.

From 1963 to 1967, Mr. Halliday was a legislative assistant to former senator Len B. Jordan (R-Idaho). From 1967 to 1969, he was assistant to the general counsel for the National Association of Electric Companies. From 1969 to 1973, he was vice president and general counsel of the Magazine Publishers Association.

In 1973, he was appointed assistant postmaster general for government relations, a job he held until 1975. Since 1977, he had been vice president of the National Association of Greeting Card Publishers.

He was a member of the D.C. and Missouri bar associations.

Survivors include his wife, Alice Ginther Harting Halliday of Alexandria; three sons, Robert W., William N., and John Thomas, all of St. Louis; a daughter, Katherine D. Higgins of St. Louis; his mother, Mrs. William Norman Halliday of Quincy; two brothers, Robert W., of Boise, Idaho, and John Meech, of Mill Valley, Calif.; two sisters, Elizabeth Bayer of Boise, and Jean Baggerman of Alameda, Calif., and two grandchildren.