| J. Thielmann | J+J | Jaeger | Jahns | JAKOB | JAQUET | JDT | JEAN MULLER | Jenaer | JEONFF |
| JM Concept | Joachim | John | JOHNSON | jola | JOST | JOUCOMATIC | jovyatlas | JRA | Juchheim |
| JUMO | Jung | Jungmichel | JVL | JWFROEHLICH |
| Nadella | NANN | NASS | NEGELE | NETTER | Niezgodka | NKL | Noding | NOLTA | NORD |
| NORELEM | Norican | NORMA | NORTRONIK | NOTHELFER | novafluid | Novotechnik | NSM |
| O.M.B. | OCTACOM | ODU | Oelde | Oerlikon | OEZ | OHO | Oil | Olaer | OMAL |
| OMEGA | omer | OMRON | OMS | optek-danulat | Optima | ORGATEX | ORTLIEB | Ortlinghaus | |
| ORVEM | Oskar | OTT-JAKOB | OTTO GANTER | Otto Huber | Otto Suhner | Overgaard |