| Country: | Slovenia |
| Joined Fiba: | 1992 |
| Fiba Zone: | FIBA Europe |
| National Fed: | Košarkarska zveza Slovenije |
| Wc Championship: | U19 World Cup |
| Wc Appearances: | 2 |
| Wc Medals: | None |
| Zone Championship: | U18 EuroBasket |
| Zone Appearances: | 18 |
| Zone Medals: | 2002 2019, 2024 |
| Zone Championship2: | U18 EuroBasket Division B |
| Zone Appearances2: | 4 |
| Zone Medals2: | 2008 2018 2015 |
| H Body: | FFFFFF |
| H Shorts: | FFFFFF |
| A Body: | 00506A |
| A Shorts: | 00506A |
The Slovenia men's national under-18 and under-19 basketball team (sl|Slovenska košarkarska reprezentanca do 18 in mlajših od 19 let) represents Slovenia in international under-18 and under-19 competitions.[1] It is organized and run by the Basketball Federation of Slovenia (Košarkarska zveza Slovenije).
See main article: FIBA U18 EuroBasket.
| Year | width=25 | ! | width=25 | ! | width=25 | ||
|---|---|---|---|---|---|---|---|
 1992 | Did not participate | ||||||
 1994 | 7th | 7 | 4 | 3 | |||
 1996 | Did not participate | ||||||
 1998 | 7th | 8 | 4 | 4 | |||
 2000 | 9th | 7 | 4 | 3 | |||
 2002 | 2nd | 8 | 7 | 1 | |||
 2004 | Did not participate | ||||||
| 2005 | 10th | 8 | 6 | 2 | |||
 2006 | 14th | 8 | 2 | 6 | |||
| 2007 | 15th | 6 | 2 | 4 | |||
| 2008 | Division B | ||||||
| 2009 | 12th | 8 | 2 | 6 | |||
 2010 | 10th | 8 | 3 | 5 | |||
 2011 | 12th | 8 | 2 | 6 | |||
 2012 | 10th | 8 | 3 | 5 | |||
| 2013 | 16th | 9 | 1 | 8 | |||
 2014 | Division B | ||||||
| 2015 | |||||||
| 2016 | 11th | 6 | 2 | 4 | |||
 2017 | 14th | 7 | 2 | 5 | |||
| 2018 | Division B | ||||||
| 2019 | 3rd | 7 | 4 | 3 | |||
| 2022 | 4th | 7 | 4 | 3 | |||
 2023 | 8th | 7 | 3 | 4 | |||
 2024 | 3rd | 7 | 6 | 1 | |||
| Total | 18/25 | 134 | 61 | 73 | |||
See main article: FIBA Under-19 Basketball World Cup.
| Year | width=25 | ! | width=25 | ! | width=25 | ||
|---|---|---|---|---|---|---|---|
| 1995 | Did not participate | ||||||
 1999 | |||||||
| 2003 | 7th | 8 | 3 | 5 | |||
| 2007 | Did not participate | ||||||
 2009 | |||||||
| 2011 | |||||||
 2013 | |||||||
| 2015 | |||||||
 2017 | |||||||
| 2019 | |||||||
| 2021 | |||||||
| 2023 | 9th | 7 | 5 | 2 | |||
 2025 | Qualified | ||||||
| 2027 | To be determined | ||||||
| Total | 2/14 | 15 | 8 | 7 | |||