Harvey Lewis Jr., 29, a researcher in the Department of Pediatrics at Howard University Hospital and a former counselor for D.C. drug treatment and mental health centers, died of cancer Wednesday at George Washington University Hospital.

A psychologist, Mr. Lewis was a counselor for the D. C. Community Mental Health Center and the D. C. Narcotics Treatment Administration before joining Howard University Hospital in 1979. He also had been an instructor in psychology at the University of Maryland while earning a master's degree in psychology there.

Mr. Lewis was born in Red Oak, N.C., and reared in Washington. A musical prodigy, by the age of 9, he had taught himself to play organ, piano, clarinet, trombone and drums, had written at least two religious songs, and begun a long tenure as chior director of the Star of Bethlehem Church of God in Christ in Washington.

Mr. Lewis was ordained a minister in the International Church of God in Christ in the early 1970s. He served as minister of music at the church and established the church's music school. He was a church elder, a former president of the church's day-care center and a former Sunday school teacher. He also had directed Howard University's gospel choir and served as director of the State Youth Choir for D. C.

He wrote the music for six religious record albums, which he directed and recorded with the Star of Bethlehem church choir, the last of which was completed in December 1979.

Under his direction, the Star of Bethlehem choir won first place in the choir division of the International Youth Congress in 1972, 1973, 1974, 1975 and 1977. Mr. Lewis also won numerous other awards for his music-related church activities.

Mr. Lewis, who lived in Gaithersburg, earned a bachelor's degree in psychology from Howard University and a master's degree in counseling from the old Federal City College here, now part of the University of the District of Columbia.

Survivors include his wife, Gwendolyn, and two children, Ellaina and Harvey Vernon, all of Gaithersburg; his parents, Harvey Sr. and Gloria F. Lewis of Washington, and two sisters, Gloria Marie Bennaugh of Accokeek, Md., and Winona Jones of Washington.