Flora McClarty Cassell, 68, a retired employe of the Interior Department who was active in service organizations, died Saturday at the Washington Hospital Center after a stroke.

She had helped organize and served as president of both the Washington Chapter of the Urban League Guild and the Friends of Nigeria, Mrs. Cassell had served on the boards of the Southeast Neighborhood House and the Phyllis Wheatley YWCA.

She also had belonged to the League of Women Voters.

She did secretarial work in the Interior Department's old Bureau of Reclamation for nearly 20 years before retiring in 1976.

She also had been active in the Ladies of Charity, a Catholic organization in Bowie, and in the Sodality of Ascension Catholic Church in Bowie.

She was the widow of Albert Irving Cassell, a Washington architect who died in 1969.

Survivors include two sons, Charles and Albert, both of Washington; five daughters, Gervaise Lee of Bethesda, and Elberta Butler, Janice Spencer, and Paula and Gabrielle Cassell, all of Washington; two sisters, Dr. Janice M. Marana, of Chicago, and Arline Rollins, of Columbus, Ohio, and eight grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the building fund of Ascension Catholic Church.