Junior world championships have been held annually since 1990. Australia hosted the 2007 event at Dubbo.
The best performances by ONSW members at "JWOC" are:
Long - 4th Julian Dent 2005
Middle - 8th Julian Dent 2005
Sprint - 6th Matt Parton 2006
ONSW athletes have represented Australia at junior world championships as follows:
| Name | Club | Year(s) | Name | Club | Year(s) | |
| Josh Blatchford | Newcastle | 2013 | Nicola Blatchford | Newcastle | 2013-15 | |
| Grant Bluett | Bennelong Northside | 1991-92 | Tracy Bluett | Bennelong Northside | 1991-95 | |
| Ant Burnett | Big Foot / KNOX | 1990 | Felicity Brown | Central Coast | 2004 | |
| Duncan Currie | Garingal | 2019 | Julie Calder | Garingal | 1993-94 | |
| Michael Davis | SHOO | 1995 | Michele Dawson | Garingal | 2012-14 | |
| Aidan Dawson | Garingal | 2015 | Phoebe Dent | Central Coast | 2002 | |
| Julian Dent | Central Coast | 2002-05 | Erika Enderby | Newcastle | 2022, 2023 | |
| Alastair George | Big Foot | 2018-19 | Mary Fien | Big Foot | 1990, 1992 | |
| Kasimir Gregory | Northern Tablelands | 2012 | Alison Jones | Waggaroos | 1993, 1995-96 | |
| Andrew Hill | WHO | 1999 | Georgina Macken | Waggaroos | 1992 | |
| Cooper Horley | Garingal | 2023 | Orla Murray | Uringa | 1999 | |
| Alex Massey | Newcastle | 2012 | Nea Shingler | Big Foot | 2021 to 2023 | |
| Dave Meyer | SHOO | 2004-05 | ||||
| Ian Meyer | SHOO | 2000-01 | ||||
| Matt Parton | Goldseekers / NTOC | 2006 | ||||
| Peter Preston | Newcastle | 2000, 2002-03 | ||||
| Rob Preston | Newcastle | 1997 | ||||
| Matt Sherlock | Big Foot | 1992 | ||||
| Ewan Shingler | Big Foot | 2021-22 | ||||
| Toby Wilson | Garingal | 2017 | ||||
| Sam Woolford | Bush n Beach | 2022, 2023 |
* 2021 team was selected but did not compete due to covid situation
Mountain Bike Orienteering
Junior world championships have been held annually since 2008.
The best performances by ONSW members at "MTBO JWOC" are:
Long - Lucy Mackie 7th 2017
Middle - Lucy Mackie 2nd 2017
Sprint - Lucy Mackie 16th 2017
ONSW athletes have represented Australia at junior world championships as follows:
| Name | Club | Year(s) | Name | Club | Year(s) | |
| Fergus Mackie | Big Foot | 2016-17 | Lucy Mackie | Big Foot | 2016-17 |
