Eric Paepcke, 75, a landscape architect who had practiced in the Washington area for the last 25 years, died at Georgetown University Hospital on Sunday following a heart attack.

In addition to planning the landscaping of a number of public and private buildings in this area, including the National Academy of Sciences, the U.S. Naval Academy at Annapolis and the Egyptian Embassy here, Mr. Paepcke designed the gardens of the U.S. embassies in Lima, Peru, and Port-au-Prince, Haiti. A characteristic of his work was the attention he paid to site engineering, drainage, erosion control, soil conditions and plant growth.

A native of Germany, Mr. Paepcke studied agronomy and botany at the University of Gottingen. He came to the United States in 1929 and subsequently worked in Charlotte, Vt.

During World War II, he was an Army counter-intelligence officer. He served in Germany during and after World War II. He lived in New York for a number of years and moved to Washington in the mid-1950s.

Mr. Paepcke's marriage to the former Eleanor Robertson Jones ended in divorce.

Survivors include his wife, the former Ruth Adams of Washington; two children by his first marriage, Eric Pace of New York City and Mrs. John H. Trolinger of Houston, and four grandchildren.