| Akronim | Penjelasan |
| J |
| JAK | Jarak di Antara Kuartil (Inter-Quartile Range). |
| JAKIM | JAbatan Kemajuan Islam Malaysia. |
| Jam. | [kitab injil] James (Yakobus). |
| Jan. | January (Januari). |
| Jb. | [kitab injil] Job (Ayub). |
| JBIC | Japan Bank for International Cooperation. |
| JD | Jack Daniel's (whiskey). |
| JDA | Joint Development Area. |
| Jdg. | [kitab injil] Judges (Hakim-Hakim). |
| Jer. | [kitab injil] Jeremiah (Yeremia). |
| Jh. | Johor. |
| JICA | Japan International Cooperation Agency. |
| JJ | [tidak rasmi] Jinjang. |
| Jk. | Jakarta. |
| JKKK | Jawatankuasa Keselamatan dan Kemajuan Kampung (Village Development and Security Committee). |
| jkps. | juta kaki padu sehari. |
| JKR | Jabatan Kerja Raya. |
| JMTI | Japan and Malaysia Technical Institute. |
| JOA | Jabatan Orang Asli. |
| Joe. | [kitab injil] Joel (Yoel). |
| Joh. | [kitab injil] John (Yohanes). |
| Jon. | [kitab injil] Jonah (Yunus). |
| Jos. | [kitab injil] Joshua (Yosua). |
| JP | [tidak rasmi] Jaga Pintu, Jaksa Pendamai, Justice of Peace. |
| JPA | Jabatan Perkhidmatan Awam, Jawatankuasa Pelaburan Asing (Foreign Investment Committee). |
| JPEG | Joint Photographic Experts Group. |
| JPH | Jabatan Perkhidmatan Haiwan (Department of Veterinary Services). |
| JPJ | Jabatan Penyiasatan Jenayah (Criminal Investigation Department). |
| JPSHK | Jawatankuasa Penstrukturan Semula Hutang Korporat (Corporate Debt Restructuring Committee). |
| JPS | Jabatan Pengairan dan Saliran. |
| JPT | Jabatan Parit dan Taliair. |
| JRDA | Jengka Regional Development Authority (Lembaga Kemajuan Wilayah Jengka). |
| JSM | Johan Setia Mahkota. |
| JT | Jabatan Telekom. |
| Jud. | [kitab injil] Jude (Yudas). |
| Jul. | July (Julai). |
| Jun. | June (Jun). |
| JVC | Japan's Victor Company. |
| Jw. | Jawa. |
