| Abbreviation | Definition |
|---|---|
| JMC | John Mason Cook |
| JME | John M. Eisenberg, M. D., M. B. A. |
| JMJ | Jam Master Jay |
| JMS | J. Micheal Straczynski |
| JMS | Joe Michael Straczynski |
| JMS | John Michael Stipe |
| JMW | Joseph Mallord William (painter) |
| JN | John Nevil |
| JND | John Nelson Darby |
| JP | Jason Polakow |
| JP | Jean Passepartout |
| JP | Jim Payne |
| JP | Jimmy Page |
| JP | John Paul |
| JP | Jonathan Peters |
| JP | Josh Price |
| JPGR | John, Paul, George, and Ringo |
| JPI | Pope John Paul I |
| JPJ | John Paul Jones |
| JPR | Jean Pierre Roland |