Claire C. Cochran, 67, a retired legal secretary for the Marriott Corporation who had worked to help organize Project HOPE, died of cancer Tuesday at Georgetown University Hospital.

When Project HOPE (Health Opportunities for People Everywhere) was founded in 1959 by Washington physician Dr. William B. Walsh, Mrs. Cochran served as his "Girl Friday" and the organization's only employe. Besides running the Washington office, she arranged for visas for the medical men and women who were to staff the hospital ship S.S. Hope, handled donations of tons of drugs, food and equipment for the project, and planned parties and other functions to raise funds.

A Washington area resident since 1939, Mrs. Cochran was a secretary to former respesentative Knute Hill (D-Wash.). During World War II, she was a private secretary to Sen. Warren G. Magnuson (D-Wash.).

She had accompained her husband, Blake Cochran, a Foreign Service officer, to assignments in Egypt, Africa, the Mideast and Europe. He died in 1975.

Mrs. Cochran was a legal secretary for Marriott for 10 years before her retirement in September.

She was born in the state of Washington and attended the University of Washington. She lived in Chevy Chase.

She was active for many years in the Association of American Foreign Service Women.

Survivors include a son, Charles H., of Bethesda; a brother, Stanley Atwood, and a sister, Florence Merryman, both of Seattle, another sister, Jean Jonas of San Francisco, and a granddaughter.

The family suggests that expressions of sympathy be in the form of contributions to the Scholarship Fund, American Foreign Service Association, Washington.