- 1 Machine guns
- 28 Machine shops
- 39 Machinery
- 141 Machinery Hall
- 11 Machinery industry
- 1 Machpelah Cemetery
- 7 Mack, E.
- 1 Mackay, Charles, 1814-1889
- 3 Mackellar, Smiths & Jordan
- 2 Mackinac, Michigan
- 50 Maclise, Daniel, 1806-1870
- 1 MacPherson, John, d. 1775
- 1 Macready, Catherine Frances Birch, 1835-1869
- 17 Macready, William Charles, 1793-1873
- 1 Macready, William Charles, 1832-1871
- 2 Macrone, John, Mrs.
- 1 Madagascar
- 1 Madden, Richard Robert, 1798-1886
- 14 Madeira
- 1 Madeira Hill & Co. Coal
- 1 Madison Spinning Co.
- 1 Madison, Wisconsin
- 1 Madonna of San Sisto (Sculpture)
- 1 Madonnas
- 1 Madrid, Spain
- 28 Magazine publishing industry
- 6 Magazines (periodicals)
- 8 Magdalen Society
- 1 Magee Furnace Co.
- 1 Magee's Stationary Store
- 3 Magi
- 35 Magi - Adoration
- 3 Magi - Before Herod the Great
- 2 Magi - Dream
- 3 Magi - Journey
- 10 Magic
- 1 Magic & Electric Hair Curler Co.
- 3 Magistrates
- 2 Magnification
- 1 Magnifying glasses
