Dorothy Boyle Huyck, 54, a Washington freelance writer who contributed articles on travel and conservation to newspapers and magazines, died of cancer Friday at the National Institue of Health.

For the past five years, she had been a contract worker with the National Park Service, and was writing a history of women employes of the Park Service at the time of her death.

Mrs. Huyck's articles had appeared in The New York Times, and the Smithsonian. She was the author of an article on trees that are found in the Washington area, which appeared in "American Forests," wrote about a family vacation, which was featured in The Christian Science Monitor, and contributed travel articles to The Washington Post.

She was a native of Madison, Wis., and graduated from Carleton College in Northfield, Minn., before coming to Washington in 1946.

Mrs. Huyck worked for the State Department from 1946 to 1951 as a liaison officer to agricultural agencies.She was a camping consultant to the National Park Service from 1962 to 1967 and helped write portions of camp ground directories.

She was a member of St. Peter's Episcopal Church in Arlington.

Survivors include her husband of 32 years, Earl, of the home in Bethesda; two daughters, Heather, of Glen Echo, Md., and Holly, of Berkeley, Calif., and a sister, Elizabeth-Jo Boyle Rule, of Denver, Colo.

The family suggests that expressions of sympathy be in the form of contributions to the Dorothy Boyle Huyck Memorial Fund for Women's Theological Education at the Virginia Theological Seminary in Alexandria, NOW for the Equal Rights Amendment, or the American Cancer Society.