Francis Fabian Miller, 88, a retired plate printer for the Bureau of Engraving and Printing and a veteranf of World War I who was active in veterans organizations, died of pneumonia Thursday at the Veterans Administration Hospital in Washington.

A third-generation Washingtonian, Mr. Miller attended Taft Junior High School. In about 1914, he joined the Bureau of Engraving and Printing.

After serving in the Army during World War I, he returned to the bureau, where he worked until the late 1920s. He then worked for an insurance company. In the late 1930s, he returned to the bureau a second time. He was a plate printer when he retired in 1961 after 36 years of service.

Mr. Miller was a founder and former commander of the American Legion Post at the bureau and a charter member of the Silver Spring American Legion Post and the legion's 40 and 8 Society.

During the Great Depression of the 1930s, Mr. Miller helped organize several legion welfare programs. Through the legion, he also helped organize blood donor programs at Children's Hospital and the donation of a permanent lighting system for the Tomb of the Unknown Soldier at Arlington National Cemetery.

A Silver Spring resident for 39 years, Mr. Miller served as an air raid warden and a draft board member there during World War II.

He was a member of St. Michael's Catholic Church in Silver Spring, Kane Lodge of the Knights of Columbus and the Elks Club of Silver Spring.

Survivors include his wife of 53 years, Grace, of Silver Spring; a son, Francis F. Jr., of Ellicott City, Md.; three daughters, Virginia Thompson of Wheaton, Dorothy Farquhar of Silver Spring, and Marilyn Plymale of Smith Mountain Lake, Va.; two sisters, Dorothy Coleman of Charleston, Ill., and Loretta Reed of Honolulu, Hawaii; a brother, William Miller of Las Vegas, Nev., 14 grandchildren and one great-grandchild.