Eliska Hasek, daughter of Mr. Joseph Karel Hasek of Washington, D.C. and Mrs. Milan Smutny of London, England, and Nicholas Jefferson Coolidge, son of Mr. Harold Jefferson Coolidge of Beverly, Mass. and Helen Isaacs Coolidge of this city, were married Sunday at the Georgetown home of Mr. and Mrs. Guy Martin. The ceremony was performed by Judge Edwin Steel Jr. of Wilmington, Del. Monsignor Joshua Mundell of this city, gave the blessing.

Wearing white satin and a family veil of Brussels lace, the bride was attended by Rose-Marie Howells, daughter of Mr. and Mrs. William Dean Howells, as the flower girl and Mrs. Howells as the matron of honor. The groom's father served as best man. Jason Herrick, son of Mr. and Mrs. George Herrick, and Gerard Griffin, son of Mr. and Mrs. Richard B. Griffin Jr., also participated, accompanied by H. Clayton Cook, Thomas R. Coolidge, Jan Hasek, George Herrick, William Dean Howells, Campbell James, Robert A. G. Monks, and Herbert S. Stone.

Since 1963 Mrs. Coolidge has served as an assistant at the White House, where she is Director of the Office of Presidential Messages. An alumna of the Georgetown Visitation Convent Preparatory School of Foreign Service. Her father is an international economic consultant and foreign trade specialist here. He was president of the Hasek Bank in Prague, which was founded by her grandfather, Francis Hasek, who was also president of the Prague Stock Exchange and of the Czechoslovak Bankers Association.

Mr. Coolidge, a direct descendant of Thomas Jefferson, was graduated from Groton School; Harvard College, where he was a member of the Delphic Club and the Varsity Club; and the Varsity Club; and the Harvard Law School. He is a vice-president and director of Kidder, Peabody & Co., Inc. His father is the noted international conservationist and honorary president of the International Union for Conservation of Natural Resources.

The couple will reside here and in New York.