Isaac Newton Baker (March 12, 1838 – March 23, 1923) was an American writer and editor who was private secretary to, and biographer of, Robert G. Ingersoll. He was an editor of the American Sunday-School Times.

He was born in Philadelphia, where he died in 1923 of arteriosclerotic heart disease.

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1838 births
1923 deaths
Writers from Philadelphia
19th-century American writers
Deaths from arteriosclerosis