Dr. and Mrs. John Edward Hutchinson III of Chappaqua, N. Y. and Lynch Station, Va. have announced the engagement of their daughter, Niki Laurene to George B. Holmes Jr., son of Mr. and Mrs. George B. Holmes of Washington, D. C. A small family wedding is planned for September 9.

The future bride, who will enter law school at Harvard University in September, graduated with the Class of '78 from Yale University majoring in political science. She is an alumna of St. Hilda's and St. Hugh's School in New York City and graduated from Horace Greeley High School in Chappaqua. Her father is associate attending surgeon at the St. Luke's Hospital Center specializing in cardiac surgery and he is also associate clinical professor of surgery at the College of Physicians and Surgeons, Columbia University. Her mother is a board member of the United Negro College Fund and the Chappaqua Symphony Orchestra and chairwoman of its membership committee, and was formerly on the faculty of the Clark College in Atlanta, Ga. Miss Hutchinson is the niece of Mabel D. Haden, Esquire and councilwoman Hilda Mason of this city.

Mr. Holmes, an alumnus of Woodward Preparatory and St. John's College High School here, is a '76 graduate with a major in biology from Yale University where he is now a junior medical student. His father is a management analyst with the Department of Labor and his mother is a mathematical statistician with the Social Security Administration.