Indiana's 12th congressional district was acongressional district for theUnited States House of Representatives inIndiana. It was eliminated as a result of the1940 census. It was last represented byLouis Ludlow who was redistricted into the11th district.

Member	Party	Years	Cong ress	Electoral history
District created March 4, 1875
Andrew H. Hamilton (Fort Wayne)	Democratic	March 4, 1875 – March 3, 1879	44th 45th	Elected in 1874. Re-elected in 1876. Retired.
Walpole G. Colerick (Fort Wayne)	Democratic	March 4, 1879 – March 3, 1883	46th 47th	Elected in 1878. Re-elected in 1880. Retired.
Robert Lowry (Fort Wayne)	Democratic	March 4, 1883 – March 3, 1887	48th 49th	Elected in 1882. Re-elected in 1884. Lost re-election.
James B. White (Fort Wayne)	Republican	March 4, 1887 – March 3, 1889	50th	Elected in 1886. Lost re-election.
Charles A. O. McClellan (Auburn)	Democratic	March 4, 1889 – March 3, 1893	51st 52nd	Elected in 1888. Re-elected in 1890. Retired.
William F. McNagny (Columbia City)	Democratic	March 4, 1893 – March 3, 1895	53rd	Elected in 1892. Lost re-election.
Jacob D. Leighty (St. Joe)	Republican	March 4, 1895 – March 3, 1897	54th	Elected in 1894. Lost re-election.
James M. Robinson (Fort Wayne)	Democratic	March 4, 1897 – March 3, 1905	55th 56th 57th 58th	Elected in 1896. Re-elected in 1898. Re-elected in 1900. Re-elected in 1902. Lost re-election.
Newton W. Gilbert (Fort Wayne)	Republican	March 4, 1905 – November 6, 1906	59th	Elected in 1904. Resigned to become Judge of First Instance inManila,Philippines.
Clarence C. Gilhams (LaGrange)	Republican	November 6, 1906 – March 3, 1909	59th 60th	Elected to finish Gilbert's term. Re-elected in 1906. Lost re-election.
Cyrus Cline (Angola)	Democratic	March 4, 1909 – March 3, 1917	61st 62nd 63rd 64th	Elected in 1908. Re-elected in 1910. Re-elected in 1912. Re-elected in 1914. Lost re-election.
Louis W. Fairfield (Angola)	Republican	March 4, 1917 – March 3, 1925	65th 66th 67th 68th	Elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922. Lost renomination.
David Hogg (Fort Wayne)	Republican	March 4, 1925 – March 3, 1933	69th 70th 71st 72nd	Elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Redistricted to the4th district and lost re-election.
Louis Ludlow (Indianapolis)	Democratic	March 4, 1933 – January 3, 1943	73rd 74th 75th 76th 77th	Redistricted from the7th district andre-elected in 1932. Re-elected in 1934. Re-elected in 1936. Re-elected in 1938. Re-elected in 1940. Redistricted to the11th district.
District eliminated January 3, 1943

• Martis, Kenneth C. (1989).The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982).The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present

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