William F. Babbington, 66, a consultant on electronic engineering and marketing and a retired director of the systems engineering department at Fort Meade, Md., died of pneumonia Thursday at the Washington Hospital Center.

Mr. Babbington was born in Washington, graduated from St. John's College High School here and earned a bachelor's degree in electrical engineering at Catholic University in 1935.

He worked for the Bureau of Engraving until he went into the Navy in World War II. While in the service, he studied electonics at Harvard University and the Massachusetts Institute of Technology. In 1946, he returned to civilian life and went to work as an engineer in the Bureau of Ships in the Navy Department.

In 1956, he transferred to the Department of the Army and was named head of the systems engineering department at Fort Meade. He retired from that post in 1964, having completed 30 years of federal service.

Since then, he had been a private consultant on electronic engineering and marketing matters.

Mr. Babbington, who lived in Chevy Chase, was a member of the Catholic Youth Organization and had coached basketball, baseball and football for the CYO, the lIons Club and other groups. He also was a member of the Knights of Columbus and of the parish of the Shrine of the Most Blessed Sacrament in Chevy Chase.

Survivors include his wife, the former Marie McDermott, and a son, William F. Jr., both of Chevy Chase, one sister, Doris Smarey of Washington, and four grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the St. John's College High School Scholarship Fund, 2700 Military Rd. NW, Washington, D.C., or to a charity of one's choice.