Melodi Grand Prix Junior 2003 was the second music competition in Norway in the series Melodi Grand Prix Junior for children aged 9 and 15 years. The winner of 2003 was the group 2U with their song "Sinsykt Gal Forelsket" (meaning crazy in love).
The album Melodi Grand Prix Junior 2003 containing the songs of the finals reached #4 on the VG-lista Norwegian Albums Chart on week 38 of 2003 staying at #4 for 2 weeks.