Earl Hubert Davis, 76, an area trial lawyer since 1930 who was active in professional organizations, died of cancer Saturday at his home in Silver Spring.

He was a past-president and member of the board of governors of the D.C. Association of Plaintiffs Trial Attorneys, and also had been a member of the board of governors of the American Trial Lawyers Association. He had been chairman of the District Bar Association's domestic relations committee and a member of its steering committee of the Bar's negligence division.

Mr. Davis had been a trustee of the D.C. Legal Aid Society from 1968 to 1977, and was named Plaintiff's Lawyer of the Year in 1961 by the Association of D.C. Plaintiffs Trial Attorneys.

He was a 32nd degree Mason and member of the Almas Temple. He also was a member of the Elks and the Capitol Hill Club.

Mr. Davis was born in West Pittston, Pa., and was a 1927 graduate of the Dickinson School of Law. He earned a master's degree in law at National University law school in 1928.

His first wife, Angela Chapelier Davis, died in 1954, and his second wife, Ruth Jacobs Davis, died in 1961. Survivors include a sister, Grace Brown of Wilkes-Barre, Pa.