Matthew Gault Emery (September 28, 1818 – October 12, 1901) was the twenty-first Mayor of the City of Washington, D.C. from 1870 to 1871, when the office was abolished.

Born in Pembroke, New Hampshire, Emery moved to Baltimore, Maryland at the age of 19 (in 1837) and began apprenticing as an architect and builder.

Three years later, he moved to Washington in hopes of gaining U.S. government contracts to construct Federal buildings.

Joining the newly formed Republican Party, he then acted as a marshal at the 1860 inauguration of Abraham Lincoln.

He purchased the Washington home of William Tecumseh Sherman when the Civil War hero moved to St. Louis, dying there on October 12, 1901, at the age of 83.