Albert F. Beasley, 73, a Washington lawyer for nearly 50 years who had served as a legal officer in the Navy during World War II, died Monday at Suburban Hospital in Bethesda after a heart attack.

From 1931 until 1951, when he established a private law practice, Mr. Beasley was associated with the Washington law firm of Brashears and Townsend, later Brashears, Beall and Beasley.

Primarily a trial attorney, he specialized in corporate, contract, general insurance, negligence, probate, real estate and transportation matters.

Mr. Beasley also specialized in cases before the Interstate Commerce Commission.

A retired Navy Reserve lieutenant commander, he served for three years with the Navy during World War II as a judge advocate, a legal assisatnce officer and as defense counsel in about 50 cases tried before the general courts-martial. He resigned his commission in 1953.

Mr. Beasley was born in Birmingham, Ala., and graduated from Howard College, now Samford University, in Alabama. He earned a law degree from George Washington University law school.

He was a fellow of the American College of Trial Lawyers and served as the college's D.C. state chairman from 1962 to 1964. From to 1958, he was director of the D.C. Bar Association and served as chairman of a number of bar association commitees. He belonged to the Vinson Club, a legal organization.

Mr. Beasley was a member of the Judical Conference of the D.C. Circuit for 12 years.

He lived in Bethesda and was a member of the Columbia Country Club.

Survivors include his wife, Helen F., of Bethesda. CAPTION:

Picture, Albert F. Beasley