Isabelle D. Finley, 58, a retired government social worker who was active in church and professional organizations, died of cancer July 23 at the Washington Home Hospice. She lived in Washington.

Mrs. Finley was a social case worker in the child welfare division of the old D.C. Welfare Department from 1957 to 1965, then spent three years as a social worker at the Veterans Administration Hospital here. From 1968 until retiring in 1979, she was a supervisory social worker in the social rehabilitation unit of the D.C. Human Resources Department.

In addition to her work with the government, she was a field instructor in the University of Maryland's school of social work from 1968 to 1973. She was a board member and second vice president of the D.C. Association of Retarded Citizens, and had chaired committees on membership, and ways and means. She was a member of the National Association of Social Workers.

She was a member of Mt. Jezreel Baptist Church in Washington where she had taught Sunday school and helped with the day care center program.

Mrs. Finley was born in Alabama and reared in North Carolina. She moved here in 1940 and served in the Women's Army Corps (WACs) during World War II. She worked for the U.S. Civil Service Commission from 1945 to 1952. She earned degrees in sociology and social work at Howard University in the 1950s. She also had attended Howard's law school.

Survivors include her husband, Augustus Finley Jr. of Washington, whom she married in 1941; a daughter, Dr. Olivia I. Finley, also of Washington, and a sister, Nell O. Roberts of El Paso, Tex.