| McConnell's spinetail | McConnellschlüpfer |
| McCown's longspur | McCownspornammer |
| McCoy | McCoy |
| McCulloch County | McCulloch County |
| McCune-Reischauer | McCune-Reischauer |
| McDonald's restaurant | McDonald's-Restaurant |
| McDonaldization | McDonaldisierung |
| McDonnell Aircraft | McDonnell Aircraft Corporation |
| McDonnell Douglas | McDonnell Douglas |
| McDonnell Douglas DC-X | Delta Clipper |
| McDowell | MacDowell |
| McDowell County | McDowell County |
| McFly | McFly |
| McGill University | McGill University |
| mcgillite | Mcgillit |
| mcgovernite | Mcgovernit |
| McGuffin | McGuffin |
| McGuire, Go Home! | Freiwild unter heißer Sonne |
| McGurk effect | McGurk-Effekt |
| McHale's Navy | McHale's Navy |
| McHenry | McHenry |
| McHenry County | McHenry County |
| MCIA : Marine Corps Intelligence Activity | Nachrichtendienst des US Marine Corps |
| MCID : malicious call identification | Fangen |
| McIntosh | Macintosh |
| McIntosh County | McIntosh County |
| McJob | McJob |
| McKay's bunting | Beringschneeammer |
| McKay's snow bunting | Beringschneeammer |
| McKay's snowflake | Beringschneeammer |
| McKean Island | McKean |
| McKees Rocks | McKees Rocks |
| McKeesport | McKeesport |
| McKinley Park | McKinley Park |
| McKinley presidency | McKinley-Präsidentschaft |
| McKinleyville | McKinleyville |
| McKinney | McKinney |
| mckinstryite | Mckinstryit |
| McLaren | McLaren |
| McLean | McLean |
| McLean County | McLean County |
| McLean Stevenson | McLean Stevenson |
| McLennan County | McLennan County |
| McLeod syndrome | McLeod-Syndrom |
| McLeod's Daughters | McLeods Töchter |
| McLeod's syndrome | McLeod-Syndrom |
| McLibel case | McLibel-Fall |
| McLintock! | MacLintock |
| McMahon Line | McMahon-Linie |
| McMahon-Hussein Correspondence | Hussein-McMahon-Korrespondenz |
| McMaster University | McMaster University |
| McMillan | MacMillan |
| McMillan's cat shark | McMillan-Katzenhai |
| McMillan's catshark | McMillan-Katzenhai |
| McMinnville | McMinnville |
| McMullen County | McMullen County |
| McMurdo Dry Valleys | Antarktische Trockentäler |
| McMurdo Sound | McMurdo-Sund |
| McMurdo Station | McMurdo-Station |
| McNally's Luck | McNallys Glück |
| McNally's Secret | McNallys Geheimnis |
| McNamara Island | McNamara-Insel |
| McNenney's wildcat (Leopardus pardalis | Ozelot |
| mcp | Mikrokanalplatte |
| MCP : male chauvinist pig | Chauvi |
| McPherson | McPherson |
| McPherson County | McPherson County |
| McQ | McQ schlägt zu |
| MD | Doktor der Medizin |
