The Right Rev. Zoltan Beky, 75, bishop emeritus of the Hungarian Reformed Church of America and a leader among Hungarian groups here, died Sunday at Sibley Memorial Hospital following a heart attack.

Bishop Beky, a native of Hungary came to this country in 1926 as a postgraduate teheology student. He served as pastor of the Hungarian Reformed Church of Trenton, N.J. for 37 years before moving to the Washington area in 1964. In 1958, he was elected as the first bishop of the Hungarian Reformed Church in this country-

Since moving here he had served as president of the Hungarian Reformed Federation and the American Hungarian Federation.

Bishop Beky was a participant in the third general assembly of the World Council of Churches in New Delhi, India, in 1961 and at its world assembly in Nairobi, Kenya, in 1975.

In 1970, he was appointed to the presidential advisory board of the Small Business Administration and served as an advisory members of the 1971 White House conference on aging.

He also served as vice president for North America of the Presbyterian World Alliance and is said to have served communion to Presidents Eisenhower, Johnson, Nixon, Ford and Carter at the opening of Congress services held at the National Presbyterian Church here.

Survivors include his wife, the former Margaret Zombory, of the home in Bethesda; two daughters. Margaret Parker, of Fredericksburg, Va., and Gloria Lynch, of Alexandria; a sister, Maria Endreracz, of Hungary; six grandchildren and one great-grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the Bishop Beky Memorial Fund, c/o The Bethlen Home, Ligonier, Pa.