Michael George Mulhall (b. in Dublin, 29 September 1829; d. there 13 December 1900) was an Irish writer, journalist, editor and statistician.
He was educated at the Irish College, Rome. Going to Buenos Aires, he established with his brother, Edward Thomas Mulhall, in 1861 the Standard, the first daily newspaper published in English in South America.
In 1869 he coauthored with his brother Edward "The Handbook of the River Plate", the first English book printed in Argentina. It provides an exhaustive description of both Buenos Aires the city and province. The wider region of the River Plate is also discussed. Several subsequent editions were printed in 1875, 1885, and 1892. He also wrote "The English in South America" in 1875. His later publishing career was dominated by his statistical works: "Progress of the World" (1880); "Balance Sheet of the World, 1873-1880" (1881); "Dictionary of Statistics" (1883), a standard work of reference; and the "History of Prices since 1850" (1885).
In 1896 he travelled extensively in Europe collecting material for the Committee of the English Parliament reporting on a proposed department of agriculture for Ireland. The pope decorated him in recognition of his literary work, in which his wife, Marion McMurrough Mulhall, also a writer, was his assistant.