Beatrice Peebles Conlin, 68, a former Capitol Hill aide, died Wednesday of a heart ailment at the Wisconsin Avenue Nursing Home.

She was the wife of retired Army Lt. Col. Paul A. Conlin.

Born in Livingston, Tex., Mrs. Conlin grew up in Dallas. She attended Southern Methodist University and was a legal secretary in Dallas before coming to Washington in 1933 to work in the press office of the National Recovery Administration.

In 1936, she joined the staff of House Speaker Sam Rayburn, where she worked for about eight years.

After World War II, Mrs. Conlin accompanied her husband on an assignment of Germany. Later they were in Ft. Sill, Okla., and in Washington before returning to Germany in 1954.

They came back to Washington in 1957, and had lived here since then Mrs. Conlin was secretary to the dean of the Foreign School to Georgetown University from 1959 to 1961.

In addition to her husband, she is survived by three children, Ann C. Mooers, of Potomac, Elizabeth C. Smith, of Shrub Oak, N.Y., and Andrew P. Conlin, of Newton, Mass.; two sisters, Helen Perry, of Midlothian, Tex., and Kitty Bazar, of Waxahachie, Tex.; a brother, Edwin J. Peebles, of McGregor, Tex., and seven grandchilren.

The family suggests that expressions of sympathy may be in the form of contributions to the Montgomry County Heart Association.