| Machan | Albert Machan & Company (Maxan) Ltd |
| Machin | Septimus Machin |
| Machin | William Machin / James Machin |
| Machon | Fenton, Allanson & Machon |
| Machon | Joseph & William Machon |
| Machon | Tucker, Fenton, Machon & Whitelock |
| Maclaurin | Maclaurin |
| Madin | Philip Madin |
| Maillet | Simon Maillet |
| Majestic | Majestic Cutlery Forge Ltd |
| Makin | Edwin John Makin |
| Makin | James Makin & Company |
| Makin | Joseph Makin |
| Makin | Thomas Makin & Son |
| Malaingre | James Malaingre |
| Maleham | Maleham & Yeomans Ltd |
| Mallhall | Mallhall |
| Mammatt | William Mammatt & Sons Ltd |
| Manby | George Manby & Company |
| Manders | Manders Tool Company |
| Manhattan | Manhattan Cutlery Company |
| Manico | E. C. Manico & Company |
| Mannifield | G. Mannifield |
| Manson | Manson |
| Maple | Maple & Co Ltd |
| Mappin | David Mappin (Sheffield) Ltd |
| Mappin | James Mappin & Sons |
| Mappin | Joseph Mappin & Son |
| Mappin | Mappin & Webb Ltd |
| Mappin | Mappin Brothers |
| Markham | Edward T. Markham |
| Markham | Walliss Markham |
| Marlow | J. H. Marlow |
| Marples | Alfred Marples & Co |
| Marples | Marples & Company |
| Marples | Marples, Wingfield & Wilkins Ltd |
| Marples | R. W. Marples |
| Marples | Robert Marples & Son Ltd |
| Marples | Samuel & Benjamin Marples |
| Marples | Thomas Marples |
| Marples | William Marples & Sons Ltd |
| Marrian | Marrian & Wells |
| Marsden | Benjamin Marsden |
| Marsden | Blackwell & Marsden |
| Marsden | George & Charles Marsden |
| Marsden | George R. Marsden |
| Marsden | James Marsden |
| Marsden | John Marsden |
| Marsden | John William Marsden & Company |
| Marsden | L. Marsden |
| Marsden | Marsden & Lowe |
| Marsden | Marsden Brothers & Company |
| Marsden | William Marsden |
| Marsden | William Marsden |
| Marsh | Clark, Marsh & Company |
| Marsh | H. G. Marsh & Co |
| Marsh | H. G. Marsh & Company |
| Marsh | J. W. & T. Marsh |
| Marsh | James Marsh / Joseph Marsh |
| Marsh | Jordan Marsh & Company |
| Marsh | Marsh Brothers & Company Ltd (Marshes & Shepherd) |
| Marsh | Thomas & William Marsh |
| Marsh | Thomas Marsh |
| Marsh | W. & T. Marsh |
| Marshall | Brady & Marshall |
| Marshall | Christopher Marshall & Company |
| Marshall | John Arthur Marshall |
| Marshall | Marshall & Jenkinson |
| Marshall | Parkin & Marshall / William Parkin & Company Ltd |
| Marshall | S. & D. Marshall |
| Marshall | Samuel Marshall |
| Marshall | W. Marshall & Co |
| Marshes | Marshes & Shepherd |
| Martin | Arthur E. Martin & Co |
| Martin | Benjamin Martin |
| Martin | Lloyd & Martin |
| Martin | Martin Brothers & Naylor |
| Martin | Martin, Hall & Company Ltd |
| Mason | A. Mason |
| Mason | John H. Mason Ltd |
| Mason | John Mason (Sheffield) Ltd |
| Mason | Samuel Mason |
| Mason | Thomas Mason |
| Mather | Richard Mather & Son Ltd |
| Matthewman | Benjamin Matthewman & Sons |
| Matz | Kirk & Matz Ltd |
| Maw | Maw & Staley |
| Maxfield | J. & J. Maxfield Ltd |
| May | Michael May Knives Ltd |
