| Subject | English | Thesaurus |
| mil., abbr. | Air Force Junior Reserve Officer Training Corps | AFJROTC |
| abbr., scottish | Air Force Junior Reserve Officers Training Corps | AFJROTC (USAF) |
| mil., abbr. | Air Force Junior Reserve Officers' Training Corps | AFJROTC |
| abbr. | American Association of Junior Colleges | AAJC (американская ассоциация колледжей с двухгодичным курсом обучения Углов) |
| univer., abbr. | Catholic Junior College | CJC |
| school.sl., abbr. | Cedar Heights Junior High School | CHJH |
| abbr., scottish | Infantry Junior Leaders Battalion | IJLB |
| sport., abbr. | Jamestown Junior Varsity | JJV |
| univer., abbr. | Joliet Junior College | JJC |
| abbr. | Junior Account Executive | JAE |
| abbr. | Junior Achievement | JA (Alex Lilo) |
| gen. | Junior Achievement, Inc. | JAI |
| media., abbr. | Junior Achievement Weekly | JAW |
| sport., abbr. | Junior Advanced Team | JAT |
| humor., abbr. | Junior Ale Can | JAC |
| mus., abbr. | Junior Amateur Musicians | JAM |
| ed., abbr. | Junior And Middle | JAM |
| ed., abbr. | Junior Appalachian Musicians | JAM |
| univer., abbr. | Junior Attendance And Motivation | JAM |
| sport., abbr. | Junior Bowlers Tour | JBT |
| humor., abbr. | Junior Boy's Own | JBO |
| tradem., abbr. | Junior Chamber | JC |
| abbr. | Junior Chamber International | JCI |
| tradem., abbr. | Junior Chamber of Commerce | JCC |
| abbr. | Junior College | juco (grafleonov) |
| abbr. | Junior College | JC |
| univer., abbr. | Junior College Committee | JCC |
| abbr., mil. | Junior Commissioned Officer | JCO (smovas) |
| sport., abbr. | Junior Courser | JC |
| law, abbr. | Junior Crack Program | JCP |
| sport., abbr. | Junior Cycle | JC |
| abbr., scottish | Junior Division Staff College | JDSC (UK) |
| gen. | Junior Engineer Technical Society | JETS |
| busin., abbr. | Junior Engineer Training | JET |
| abbr., scottish | Junior Engineering Officer | Jengo (UK Royal Air Force) |
| univer., abbr. | Junior Engineering Technical Society | JETS |
| ed., abbr. | Junior Fellowship Kidz | JFK |
| ed., abbr. | Junior Fire Marshal | JFM |
| sport., abbr. | Junior Football League | JFL |
| abbr. | Junior Foreign Service Officers Club | JFSOC |
| abbr. | Junior Forest Warden | JFW |
| ed., abbr. | Junior Forest Wardens Club | JFW |
| sport., abbr. | Junior General Meeting | JGM |
| sport., abbr. | Junior Global Cup | JGC |
| sport., abbr. | Junior Golf Association | JGA |
| sport., abbr. | Junior Golf Tour | JGT |
| abbr. | junior grade | jaygee |
| abbr. | Junior Grand Warden | JGW |
| ed., abbr. | Junior High | JH |
| ed., abbr. | Junior High School | JHS |
| abbr., dog. | Junior Hunter | J.H. |
| sport., abbr. | Junior Hunter | JH |
| univer., abbr. | Junior Independent Work | JIW |
| abbr., scottish | Junior Leader Regiment | JLR (UK) |
| mil., abbr. | Junior Leadership Training | JLT |
| abbr. | Junior Master Gardener | JMG |
| abbr. | Junior Master Gardner | JMG |
| hobby | Junior Member | JM |
| sport., abbr. | Junior Midget | JM |
| min.prod., busin. | junior miner | (см.) junior mining company ('More) |
| relig., abbr. | Junior Missions For All | JMA |
| mus., abbr. | Junior Music Camp | JMC |
| mil., abbr. | Junior Naval Research Officers Training Corps | JNROTC |
| abbr., scottish | Junior NCO | JNCO |
| abbr. | junior officer | jo |
| mil., abbr. | Junior Officer Advisory Council | JOAC |
| mil., abbr. | Junior Officer Council | JOC |
| mil., abbr. | Junior Officer Maintenance Course | JOMC |
| abbr., scottish | Junior Officer Pilot | JOP (UK Royal Air Force) |
| abbr., scottish | Junior Officer Tactics Team | JOTT (US Navy) |
| abbr., scottish | Junior Officers Advisory Council | JOAC (USA) |
| mil., abbr. | Junior Officers' and Professional Association | JOPA |
| busin., abbr. | Junior Offshore Group | JOG |
| sport., abbr. | Junior Olympics | JO |
| abbr. | junior partner | jp |
| humor., abbr. | Junior Pee Wee | JPW |
| abbr. | Junior Police Officer | JPO |
| abbr. | Junior Priestess | JP |
| abbr. | Junior Red Cross | JRC |
| abbr. | Junior Research Fellow | JRF (Anglophile) |
| univer., abbr. | Junior Research Fellows | JRF |
| abbr. | Junior Research Fellowship | JRF (Anglophile) |
| USA | Junior Reserve Officer Training Corps | JROTC |
| abbr., scottish | Junior Reserve Officers Training Corps | JROTC |
| mil., abbr. | Junior Reserve Officers' Training Corps | JROTC |
| abbr., scottish | Junior School of Applied Photography | JSAP (UK) |
| mil., abbr. | Junior Science and Humanities Symposium | JSHS |
| ed., abbr. | Junior Scientific Master Class | JSMC |
| abbr., scottish | Junior Seaman | JS (UK Royal Navy) |
| abbr., mil., BrE | Junior Staff Course | JSC |
| humor., abbr. | Junior State Of America | JSA |
| ed., abbr. | Junior Summer Math Camp | JSMC |
| telecom., abbr. | Junior Telecom Officer | JTO |
| abbr., mil., BrE | Junior Training Corps | JTC |
| univer., abbr. | Junior University Multidisciplinary Preparation | JUMP |
| sport., abbr. | Junior Varsity Athletics | JVA |
| ed., abbr. | Junior Varsity Sports | JVS |
| mil., abbr. | Junior Watch Officer | JWO |
| univer., abbr. | Junior Year Abroad | JYA |
| chat., abbr. | Just Ask Junior | JAJ |
| school.sl., abbr. | Lake Oswego Junior High School | LOJ |
| abbr., scottish | Lieutenant, Junior Grade US Navy | Lt jg |
| mil., abbr. | Lieutenant, Junior Grade | JG (U S Navy) |
| univer., abbr. | Modesto Junior College | MJC |
| sport., abbr. | National Junior Basketball | NJB |
| ed., abbr. | National Junior Honor Society | NJHS |
| school.sl., abbr. | National Junior Honors Society | NJHS |
| mil., abbr. | Naval Junior Reserve Officer's Training Corps | NJROTC |
| school.sl., abbr. | North Junior High School | NJH |
| sport., abbr. | North Queensland Junior | NQJ |
| univer., abbr. | Northeastern Junior College | NJC |
| univer., abbr. | Orlando Junior Academy | OJA |
| USA | Outstanding Junior Investigator | OJI |
| school.sl., abbr. | Princeton Junior School | PJS |
| school.sl., abbr. | Redmond Junior High School | RJH |
| school.sl., abbr. | Riverview Junior High School | RJH |
| school.sl., abbr. | Sycamore Junior High | SJH |
| sport., abbr. | Team Junior | TJ |
| sport., abbr. | Texas Junior Anglers | TJA |
| ed., abbr. | Think Quest Junior project | TQJ |
| school.sl., abbr. | Thomas Jefferson Junior high school | TJJ |
| school.sl., abbr. | Thomas Jefferson Junior High school | TJJH |
| sport., abbr. | Top Qualifying Junior | TQJ |
| mus., abbr. | Tucson Junior Strings | TJS |
| univer., abbr. | Tyler Junior College | TJC |
| sport., abbr. | Ultimate Junior Bat Bag | UJBB |
| tech., abbr. | Ulti-Mate Junior Cushion | UMJ |
| school.sl., abbr. | Utica Junior High school | UJH |
| school.sl., abbr. | Valley Junior High school | VJH |
| sport., abbr. | Valley Junior Varsity | VJV |
| sport., abbr. | Valley Junior Warriors | VJW |
| school.sl., abbr. | Vernal Junior High School | VJHS |
| school.sl., abbr. | Vernal Junior High School | VJH |
| law, abbr. | Vesey Junior's Chancery Reports | Ves.Jr. |
| school.sl., abbr. | Wallace Junior High | WJH |
| school.sl., abbr. | Wallace Junior High School | WJHS |
| names, abbr. | Walter Boston, Junior, D. D. | WBJR |
| school.sl., abbr. | Warren County Junior High | WCJH |
| school.sl., abbr. | Warren County Junior High School | WCJH |
| sport., abbr. | Warren Junior Women | WJW |
| sport., abbr. | Warren Junior Women's League | WJWL |
| sport., abbr. | Warwick Junior Hockey | WJH |
| sport., abbr. | Warwick Junior Hockey Association | WJHA |
| tradem., abbr. | Washington Junior Board of Trade | WJBT |
| lit., abbr. | Washington Junior Board of Trade Toastmasters Club | WJBT |
| sport., abbr. | Waterloo Junior Golf | WJG |
| sport., abbr. | Waterloo Junior Golf Association | WJGA |
| school.sl., abbr. | Waterloo Junior High School | WJH |
| school.sl., abbr. | Waterloo Junior High School | WJHS |
| sport., abbr. | Webster Junior Warriors | WJW |
| sport., abbr. | Wellington Junior Varsity | WJV |
| gen. | West Indies Junior Chamber Organization, Antigua | WIJC |
| gen. | West Indies Junior Chamber Organization, Antigua | WIJCO |
| school.sl., abbr. | West Junior High School | WJH |
| school.sl., abbr. | West McDowell Junior High | WMJH |
| school.sl., abbr. | West Valley Junior High | WVJH |
| school.sl., abbr. | West Valley Junior High School | WVJHS |
| sport., abbr. | Western Junior Rodeo Association | WJRA |
| sport., abbr. | Western Regional Junior Championships | WRJC |
| univer., abbr. | Wharton County Junior College | WCJC |
| sport., abbr. | White Eagle Junior Golf | WEJG |
| school.sl., abbr. | Whittier Christian Junior High | WCJH |
| school.sl., abbr. | Whittier Christian Junior High School | WCJH |
| school.sl., abbr. | Wilkinson Junior High School | WJH |
| school.sl., abbr. | Wilkinson Junior High School | WJHS |
| school.sl., abbr. | William Moreno Junior High School | WMJH |
| school.sl., abbr. | Wills Point Junior High | WPJH |
| school.sl., abbr. | Wills Point Junior High School | WPJHS |
| school.sl., abbr. | Wilmette Junior High | WJH |
| school.sl., abbr. | Wilmette Junior High School | WJHS |
| ed., abbr. | Wilmington Junior Academy | WJA |
| sport., abbr. | Wilson Junior Soccer Club | WJSB |
| school.sl., abbr. | Wilson Southern Junior High | WSJH |
| sport., abbr. | Wimbledon Junior Tennis | WJT |
| sport., abbr. | Wimbledon Junior Tennis Initiative | WJTI |
| sport., abbr. | Wisconsin Junior Soccer League | WJSL |
| sport., abbr. | Women's Junior Olympic Compulsory | WJO |
| tech., abbr. | Woodpecker Pressure Compensating Junior Dripper | WPCJ |
| sport., abbr. | World Junior Boxing Federation | WJBF |
| sport., abbr. | World Junior Championship | WJC |
| sport., abbr. | World Junior Curling Championships | WJCC |
| sport., abbr. | World Junior Hockey Championship | WJHC |
| sport., abbr. | World Junior Races | WJR |
| sport., abbr. | World Junior Team | WJT |
| sport., abbr. | World Junior Women's Championship | WJWC |
| sport., abbr. | Worldwide Junior Golf Tour | WJGT |
| school.sl., abbr. | Zimmerman Junior High School | ZJH |
| school.sl., abbr. | Zimmerman Junior High School | ZJHS |
