Glen A. Wilkinson, 74, a Washington attorney who specialized in communications law and who since 1978 had been chairman of the board of trustees of George Washington University, died Aug. 29 at Sibley Memorial Hospital. He had cancer.

Mr. Wilkinson and his late brother, Ernest L. Wilkinson, were founders of what became the law firm of Wilkinson, Cragun & Barker. In addition to his work representing clients at the Federal Communications Commission and related procceedings, Glen Wilkinson was an expert in Indian tribal claims and also did much general legal work for Indian tribes.

His practice included tax law and government contracts, as well as criminal and civil matters before the U.S. Supreme Court. At the time of his death, he was of counsel to the law firm of Wilkinson, Barker, Knauer & Quinn, the successor firm to Wilkinson, Cragun & Barker.

A native of Ogden, Utah, Mr. Wilkinson graduated from Brigham Young University in 1934. He moved to Washington shortly thereafter and went to work as an accountant at the Bureau of Reclamation in the Interior Department. He took night classes at George Washington University and received his law degree in 1938.

In 1939, he was appointed a clerk at the old D.C. Board of Tax Appeals and the following year he was named an assistant D.C. corporation counsel. During World War II, he served in the Army in Europe. He reached the rank of lieutenant colonel. His military decorations included the Legion of Merit.

In 1946, he and Ernest Wilkinson went into private law practice together. In 1951 they formed Wilkinson, Cragun & Barker.

In addition to serving as chairman of the board of trustees at George Washington, Mr. Wilkinson was a past president of the university's Law Association and a member of the governing board of its General Alumni Association. In 1965, he received an Alumni Achievement Award and in 1973 an Alumni Service Award. In 1978, he received a Distinguished Alumnus Award from the Law Association.

Lloyd H. Elliott, the president of the university, issued the following statement: "In his quiet, dignified way, Glen Wilkinson provided the highest quality of leadership for George Washington University and gave outstanding service to his profession and our community. He was a devoted friend and his loss will be deeply felt."

Mr. Wilkinson was a member of the Burning Tree Club.

Survivors include his wife, Katherine McKinnon Wilkinson of Washington; four sons, Frederick McKinnon, of Fort Bragg, Calif., Malcolm Glen, of Baltimore, Richard Claude, of Atlanta, and Charles Symmes, of Chevy Chase; one brother, Woodrow Wilkinson of Salt Lake City, and five grandchildren.