| JAR | JAVA Archives | JAVA档案 |
| JAR | Arcadia, California | 加利福尼亚州阿卡迪亚 |
| JAR | Joint Aviation Requirement | 联合航空要求 |
| JAR | Joint Airworthiness Requirements | 联合适航要求 |
| JAR | Joint Acquisition Roadmap | 联合采办路线图 |
| JAR | J August Richards (actor) | J August Richards（演员） |
| JAR | Java Archive | Java存档 |
| JAR | Jason Andrew Relva | 杰森·安德鲁·雷瓦 |
| JAR | Just Acting Right | 表现得很好 |
| JAR | Java ARchive Compressed file archive | Java ARchive压缩文件归档 |
| JAR | Journal of Automated Reasoning | 自动推理杂志 |
| JAR | Joint Area Review | 联合区域审查 |
| JAR | Journal of Anthropological Research (University of New Mexico) | 人类学研究杂志（新墨西哥大学） |
| JAR | Jaish Al-Rashideen (Sunni Armed Groups in Iraq) | Jaish Al Rashideen（伊拉克逊尼派武装团体） |
| JAR | Joint Airworthiness Regulations | 联合适航条例 |
| JAR | Joint Aviation Requirements | 联合航空要求 |
| JAR | Just Another Rifle | 只是另一支步枪 |
| JAR | Java Application Resource | Java应用程序资源 |
| JAR | Jesus Adrian Romero (singer) | 杰西·阿德里安·罗梅罗（歌手） |
| JAR | John A. Russell Building (University of Manitoba) | 约翰·A·罗素大厦（马尼托巴大学） |
| JAR | Job Appraisal Review | 工作评估审查 |
| JAR | Journalisten Aus Russland (German: Journalists from Russia) | 记者Aus-Russland（德语：来自俄罗斯的记者） |
| JAR | Jason Andrew Relva (Green Day song) | Jason Andrew Relva（绿色日歌曲） |
| JAR | Jewish Autonomous Region (Russian Federation) | 犹太自治区（俄罗斯联邦） |
| JAR | Japan-A-Radio | 日本广播电台 |
| JAR | Joint Aviation Regulation | 联合航空条例 |
| JAR | Jack And Retract (jack aircraft and retract landing gear) | 千斤顶和收回（千斤顶和收回起落架） |
| JAR | Jornadas Argentinas de RobÓtica | Jornadas Argentinas de RobÓtica |
| JAR | Department of Justice Acquisition Regulations | 司法部采购条例 |