Cecelia M. Cunilio, 35, a planning officer for the Bureau of Rehabilitation Inc. in Washington, died April 30 in a bus accident in Morocco, where she was vacationing.

The Associated Press, quoting the French news agency Agence France Presse, said Miss Cunilio was killed when the bus on which she was riding skidded off the road and into a ditch about 30 miles from the city of Marrakech. Eighteen other passengers were injured in the accident, four seriously, the news agency said.

Born in Chicago, Miss Cunilio graduated from the University of Pennsylvania and had lived in Washington for the last 10 years. For about the last year she had been planning officer for the Bureau of Rehabilitation, a private, nonprofit agency that provides counseling and residential services for substance abusers, troubled youths and former prison inmates.

For the four previous years she had been executive director for the House of Ruth, a home for battered and homeless women. Before that she was deputy director for the Environmental Task Force. She also had worked at SOME (So Others May Eat), an organization that feeds hungry people, and Martha's Table, an organization that helps hungry children.

Miss Cunilio is survived by her parents, Mr. and Mrs. Victor Cunilio of Arlington; one sister, Marianne Jackson of New York City, and two brothers, James J. of Wayne, Pa., and Thomas V. of Gainesville, Fla.