Ellis Haworth, 83, an educator in the D.C. public schools for over 40 years who was active in civic and professional organizations, died July 1 at his home in Washington. He had cancer.

Dr. Haworth began his career in the public schools at Eastern High School, where he taught chemistry, mathematics, and physics from 1922 to 1931. For the next five years, he was head of science departments for D.C. public junior and senior high schools. Between 1936 and 1962, he was a chemistry professor at the old Wilson and then the old D.C. Teachers colleges.

From 1960 to 1970, he also was a substitute teacher at Wilson High School. He had taught summer courses in chemistry at the University of Maryland and at George Washington and Catholic universities.

Dr. Haworth was a past president of the D.C. Education Association and had served as a director of D.C. Citizens for Better Education. He had been both budget and legislative chairman of the D.C. PTA and was an honorary life member of the national PTA. He was an unsuccessful 1969 candidate for the D.C. School Board.

He was president of the Friendship Citizens Association in 1965 when that organization voted to apply for membership in the predominantly black D.C. Federation of Civic Associations. Earlier in the 1960s, he had served as president of the American University Park Civic Association. Also in the 1960s, he had been chairman of the Northwest Fair Housing Association.

Dr. Haworth was a native of Washington and a 1919 graduate of Eastern High School. He was a graduate of George Washington University, where he also received a master's degree in physics. He earned his doctorate in chemistry from Johns Hopkins University.

He was a past president of the D.C. Teachers Credit Union and had received awards from civic organizations, the federal government, and the D.C. League of Nursing.

Survivors include his wife, Elaine E., of Washington; a son, D.C. Police Officer Thomas E. Haworth of Kensington; a daughter, Holly Stephenson of Staten Island, N.Y., and four grandchildren.