The Children's Encyclopædia was an encyclopaedia originated by Arthur Mee, and published by the Educational Book Company, a subsidiary of Northcliffe's Amalgamated Press, London. It was published from 1908 to 1964. Walter M. Jackson's company Grolier acquired the rights to publish it in the U.S. under the name The Book of Knowledge (1910).

Arthur Henry Mee was an English writer, journalist and educator. He is best known for The Harmsworth Self-Educator, The Children's Encyclopædia, The Children's Newspaper, and The King's England.