John Walter Smith (February 5, 1845 – April 19, 1925), a member of the Democratic Party in the United States, held several public offices representing the state of Maryland.
From 1899 to 1900, he was a U.S.
congressman for the 1st district of Maryland; from 1900 to 1904, he was the 44th Governor of Maryland; and from 1908 to 1921, he served in the U.S.
Senate, first as the junior senator for Maryland, and from November 1912 as the senior senator.