Samuel G. Green Jr., 53, an executive with the C&P Telephone Co. where he had worked since 1953, died of septicemia Wednesday at Suburban Hospital. He lived in Silver Spring.

Mr. Green began his career at C&P as a management assistant. By the late 1970s, he was responsible for company operations in the western and eastern portions of Maryland as well as its Eastern Shore. He was named division staff manager of service order systems in 1980, and held that post until his death.

Mr. Green served with the Navy in Korea during the conflict there, and retired from the Navy reserves with the rank of captain in 1973.

Mr. Green was a past-president of the Lay Advisory Council of Wesley Theological Seminary. He was a member of the Trinity United Methodist Church in Alexandria.

Mr. Green was a native of Arlington and a graduate of George Washington High School in Alexandria. He was a 1950 graduate of the Georgia Institute of Technology.

Survivors include his wife, the former Kathryn Hairston, of Silver Spring; three sons, Gordon, of Gray, Ga., and Russell, and Dillard, both of Silver Spring; his mother, Mary Russell Green of Winder, Ga.; a brother, William B., of Houston, and a sister, Nancy Green Carmichael of Atlanta.