George Karapiperis, 57, a Montgomery County government executive and leader in the Greek Orthodox community here, died Thursday at Holy Cross Hospital after a heart attack.

An employe of Montgomery County for 25 years, he was assistant chief of the accounts division in the department of finance.

Mr. Karapiperis was president of the board of trustees of Sts. Constantine and Helen Greek Orthodox Church from 1952 to 1968. He had been elected to the board in 1953 and served on it for 20 years.

He developed the first computerized accounting system for the church. In 1963, he played a key role in establishing the area's only Greek Orthodox parochial school, the Rev. Thomas Daniels School, adjacent to the church. He was awarded the Medal of St. Paul, the highest honor bestowed on a lay person by the Greek Orthodox Church Diocese of North and South American.

Mr. Karapiperis was born in Baltimore and grew up in Washington. During World War II, he served as an Army staff sergeant with the 3rd and 20th armored divisions in Europe.

He is survived by his wife, Nicoletta, of the home in Silver Spring; a daughter, Candace Dionysios Georgoutsos, of Athens, Greece; and his mother, Kanella Karapiperis, and a sister, Stella Charles Papuchis, both of Silver Spring.