Dorothea Lewis Miller, 70, a retired chief information officer at the Administration on Aging in the Department of Health, Education and Welfare, died of cancer Tuesday at her home in Alexandria.

A native of Washington, Mrs. Miller graduated from Central High School and attended George Washington University. In the late 1920s, she was assistant editor of Equal Rights, a magazine dealing with women's issues.

About 1930, she went to work in the information office of the National Park Service and remained there until World War II. She then joined the Office of War Information, where she wrote scripts for a radio series on rationing.

Mrs. Miller began her career at HEW about 1961, and retired in 1972.

She was a freelance writer for many years and on that basis wrote movie reviews for The Washington Post in the early 1930s. She did some contract work for the Administration on Aging at HEW following her retirement.

Mrs. Miller was a founder of the old Washington Civic Theater and acted in some of its productions. She also was a 50-year member of the Washington Press Club, formerly the Women's National Press Club.

Survivors include her husband, Robert M. Miller, and a son, Michael Jon, both of the home; a daughter, Jefferson Ann James of cincinnati and three grandchildren.