| 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 |
| McClarence | E. McClarence (Cutlery & Fancy Goods) Ltd |
| McClelland | James R. McClelland |
| McClory | John McClory & Sons Ltd |
| Mcclung | C. M. McClung & Company |
| McGivern | Thomas McGivern & Son |
| McTurk | Robert Murray McTurk |
| Mead | J. Mead |
| Mearbeck | John Mearbeck |
| Medley | Ford & Medley Ltd |
| Meeson | J. W. Meeson & Sons |
| Meeson | Meeson & Green |
| Melacraft | Melacraft |
| Melling | N. W. Melling & Sons |
| Mellor | David Mellor |
| Memmott | W. G. Memmott / Memmott Brothers |
| Merrill | John Merrill & Company |
| Merrill | John William Merrill |
| Merrill | Ralph Merrill & Son / George Merrill |
| Merrill | Samuel Merrill |
| Metal | Sheffield Metal Company Ltd |
| Meteor | Meteor Industries Ltd |
| Mettam | Roberts & Mettam |
| Mexeur | Mexeur & Cie |
| Micklethwaite | Benjamin Micklethwaite |
| Middleton | Brumby & Middleton |
| Middleton | Henry Lee & Co / Lee & Middleton |
| Middleton | J. T. Middleton |
| Middleton | Middleton, Newton & Middleton |
| Middleton | Samuel Smith Middleton & Company |
| Miles | Simpson Miles |
| Miller | David Miller & Son |
| Miller | Harris Miller & Company (Cutlers) Ltd |
| Miller | Thomas Miller |
| Mills | Frank Mills & Company Ltd |
| Mills | Henry Mills |
| Mills | Joseph Mills |
| Mills | Mills, Moore & Company Ltd |
| Mills | W. Mills & Son |
| Mills | William Mills |
| Millward | Millward, Hancock & Company Ltd |
| Milner | Isaac Milner |
| Milner | John Milner & Company (Sheffield) Ltd |
| Milner | Mary Milner |
| Milner | Prescott & Milner |
| Milner | Thomas Milner |
| Milnes | Charles Milnes |
| Milns | A. Milns & Company |
| Mitchell | Fred Mitchell |
| Mitchell | Pat Mitchell (Cutlers) |
| Mitchell | R. S. Mitchell Ltd |
| Mitchell | Stuart Mitchell |
| Mitton | Paul Mitton & Company |
| Monitor | Monitor |
| Monogram | Monogram Cutlery Group |
| Montfort | De Montfort |
| Monumental | Monumental Cutlery Company |
| Moore | Douglas E. Moore |
| Moore | George Moore |
| Moore | J. Moore & Company |
| Moore | Priestley & Moore Ltd |
| Moorhouse | Henry Moorhouse |
| Moorhouse | James Moorhouse |
| Moorhouse | Moorhouse, Rushworth & Steele |
| Moorhouse | Smith & Moorhouse |
| Morbro | Morbro (Scissors) Ltd |
| Moreton | John Moreton & Company |
| Morgans | Brownhill & Morgans |
| Morris | E. & C. M Morris & Co |
| Mort | Henry Mort & Company |
| Mortimer | J. Mortimer |
| Morton | B. K. Morton & Company Ltd |
| Morton | H. Morton |
| Morton | Hatfield & Morton |
| Morton | J. & H. Morton |
| Morton | James Morton |
| Morton | James Morton |
| Morton | James Morton |
| Morton | John Morton |
| Morton | Morton Scissors |
| Morton | Swann-Morton Ltd |
| Morton | Thomas Morton |
| Morton | Ward & Morton |
| Morton | William Morton & Sons |
| Mosby | Sharrard, Mosby & Company Ltd |
| Mosforth | Askham & Mosforth |
| Mosforth | Frost, Askham & Mosforth |
| Mosley | John Mosley |
| Mosley | R. F. Mosley & Company Ltd |
| Moss | Moss & Gamble |
| Mottershaw | Mottershaw & Rowe Ltd |
| Mottram | Gregory & Mottram |
| Mottram | Mottram, Cooper & Company |
| Mottram | Thomas Mottram & Company |
| Mottram | Thomas Mottram & Sons |
| Moulson | Moulson Brothers / John Moulson |
| Mulberry | Mulberry Cutlery Company |
| Mulcrone | Mulcrone |
| Murfin | John Murfin |
| Murfin | Murfin Brothers |
| Murphy | J. Murphy |
| Murray | Lewis Murray |
| Musgrave | Musgrave & Company |
| Myatt | Myatt |
| Mycock | John & Joseph Mycock |
| Myers | C. Myers & Sons Ltd |
| Myers | John Myers & Co Ltd |
| Mylius | Wilkinson, Drabble & Mylius |
