Porter M. Ward, 67, a retired Senate committee staff member and former senatorial aide, died of cancer Wednesday at Doctor's Hospital of Prince George's County.

He retired at the end of 1974 from the old Senate Interior and Insular Affairs Committee, where he had been staff member for public lands for 10 years. He was also press liaison officer for the committee.

Mr. Ward had worked on bills involving establishment of a nationwide system of trails and the national wild and scenic rivers systems, both of which were passed by Congress. He also had helped implement a procedure for adding new wilderness areas to the national preservation system.

Mr. Ward also had been press secretary to Sen. Frank Church (D-Idaho) for seven years. Church said Thursday:

"Porter Ward was a remarkable man of may talents. . . He served the people of Idaho as a conscientious public servant, both as a member of my Senate staff and as a professional staff member of the Senate Interior Committee. . . "

Mr. Ward was born in East Wenatchee, Wash. He worked on newspapers in the state of Washington, then was bureau chief for United Press in Spokane, Wash., and Portland, Ore., before World War II.

During the war, he served with Army counterintelligence in the Far East. After the war, he became managing editor or the Lewiston (Idaho) Tribune.

From 1950 until he joined the Church staff, Mr. Ward was in radio and public relations work in Bose, Idaho.

He is survived by his wife, Jennie-Marie (Tommie) Ward, of the home in Bowie, and two sons, Christian, of New York City, and Jerry, of Vienna, Va.

The family suggests that expressions of sympathy be to the American Diabetes Association or the American Cancer Society. CAPTION: Picture, PORTER M. WARD