Indonesian Idol Junior (musim 3)
Peserta Yang Pernah Mengikuti Kompetisi Lainnya

Sebelum mengikuti Indonesian Idol Junior pada musim ini, beberapa peserta di bawah ini sebelumnya sudah mengikuti ajang pencarian bakat di beberapa stasiun televisi swasta, di antaranya:
| Peserta | Acara TV | Musim | Hasil terbaik | Catatan |
| --- | --- | --- | --- | --- |
| Adinda Shafaa | The Voice Kids Indonesia | 3 | Babak Blind Audition | * |
| Anneth Delliecia Nasution | Indonesian Idol Junior | 1 | Babak Eliminasi I | * |
| Anneth Delliecia Nasution | The Voice Kids Indonesia | 2 | Babak Final | * |
| Badnur Rizky | Indonesian Idol Junior | 1 | Babak Eliminasi II | * |
| Britney Kimberly Gunawan | Indonesian Idol Junior | 1 | Babak Eliminasi II | * |
| Britney Kimberly Gunawan | Idola Cilik | 5 | Babak Menuju Pentas | * |
| Britney Kimberly Gunawan | Indonesian Idol Junior | 2 | Babak Spekta 13 besar | * |
| Charisa Faith Lumbanraja | The Voice Kids Indonesia | 1 | Babak Battle Rounds | * |
| Clinton Lubis | La Academia Junior Indonesia | 1 | Babak Semifinal | * |
| Deven Christiandi Putra | The Voice Kids Indonesia | 1 | Babak Blind Audition | * |
| Friden Gabe Panggabean | The Voice Kids Indonesia | 2 | Babak Battle Rounds | * |
| Gemilang Abednego Simanjuntak | The Voice Kids Indonesia | 1 | Babak Blind Audition | * |
| Inggrid Ganesia | Idola Cilik | 5 | Babak Pentas 8 besar | Pada babak Audisi, Inggrid tampil sebagai trio bernama Trio Holy bersama Karen dan Tessa, kemudian tampil sebagai duo bernama Duo Teri bersama Tessa |
| Jessie Heinze | Starvoices Live | 2018 | Finalis 12 Besar (Kategori Kids) | * |
| Joaquine Bernessa | The Voice Kids Indonesia | 3 | Babak Blind Audition | * |
| Khaerunissa Resky Putri | La Academia Junior Indonesia | 1 | Babak Semifinal | * |
| Khaerunissa Resky Putri | The Voice Kids Indonesia | 1 | Babak Blind Audition | * |
| Khaerunissa Resky Putri | Indonesian Idol Junior | 2 | Babak Spekta 12 besar | * |
| Lawrence Oktavianus | Idola Cilik | 5 | Babak Menuju Pentas | * |
| Lifia Laeticia | Indonesian Idol Junior | 2 | Babak Eliminasi 2 | * |
| Marsha Ayuni | Starvoices Live | 2018 | Pemenang (Kategori Kids) | * |
| Michael Audi | Indonesian Idol Junior | 2 | Babak Audisi | * |
| Mikayla Angelee | The Voice Kids Indonesia | 3 | Babak Blind Audition | * |
| Muhammad Alde | Idola Cilik | 5 | Babak Pentas 15 besar | * |
| Muhammad Alde | The Voice Kids Indonesia | 1 | Babak Live Rounds 24  besar | * |
| Nadine Arindy Octavia Tambunan | The Voice Kids Indonesia | 2 | Babak Battle Rounds | * |
| Ninaya Kinanti | The Voice Kids Indonesia | 3 | Babak Battle Rounds | * |
| Regine Keiko | Indonesian Idol Junior | 2 | Babak Eliminasi | * |
| Regine Keiko | The Voice Kids Indonesia | 2 | Babak Blind Audition | * |
| Sherina Tiwanie | La Academia Junior Indonesia | 1 | Babak Semifinal | * |
| Sherina Tiwanie | Little Miss Indonesia | 2015 |  | * |
| Sherina Tiwanie | The Voice Kids Indonesia | 1 | Babak Live Rounds 24 besar | * |
| Zahrah Izzaty | I Can See Your Voice Indonesia | 2 | Tereliminasi di babak potongan suara sebagai Good Voice | Berperan sebagai Little Princess pada episode spesial Romaria Simbolon |
| Zahrah Izzaty | The Voice Kids Indonesia | 3 | Babak Blind Audition | * |