The Junior Eurovision Song Contest 2023 was the 21st edition of the Junior Eurovision Song Contest, held on 26 November 2023 at the Palais Nikaïa in Nice, France, and presented by Olivier Minne, Laury Thilleman, and Ophenya. It was organised by the European Broadcasting Union (EBU) and host broadcaster France Télévisions, who staged the event after winning the 2022 contest for France with the song "Oh Maman !" by Lissandro. This was the second time that the Junior Eurovision Song Contest was hosted in France, the first being in Paris in 2021.

Broadcasters from sixteen countries participated in the contest, with Estonia participating for the first time and Germany returning after its absence from the previous edition, while Kazakhstan and Serbia did not take part. This was also the first and so far only time that all members of the "Big Five" from the Eurovision Song Contest took part in the junior contest together.

The winner was France with the song "Cœur" by Zoé Clauzure, making France the second country to win the Junior Eurovision Song Contest twice in a row, after Poland. The result also marked France equaling Georgia's record for the most Junior Eurovision victories. Spain, Armenia, the United Kingdom and Ukraine completed the top five. Further down the table, Germany achieved its best result to date, Georgia tied its worst placement, and Ireland placed last for the first time.

The contest took place at the Palais Nikaïa in Nice, a multi-purpose concert hall, following the country's victory at the 2022 contest with the song "Oh Maman !" by Lissandro. This was the second time that France hosted the Junior Eurovision Song Contest, the first being in Paris in 2021.

Unlike in the Eurovision Song Contest, the winning country did not receive the automatic rights to host the next contest. However, since 2019, each contest has been hosted by the previous year's winning country, and since 2011 (with the exceptions of 2012 and 2018), the winning country has had the right of first refusal on hosting the following competition. In 2015, Italy was given the option to host but ultimately opted out of it.

Following France's win in 2022, French head of delegation Alexandra Redde-Amiel and Director General of France Télévisions Delphine Ernotte revealed that the country wishes to host the contest in 2023. On 3 April 2023, the EBU and France Télévisions announced that the contest would be held in Nice.

On 29 August 2023, the EBU announced that 16 countries would participate in the contest, with Estonia making its debut and Germany returning after a one-year absence, while Kazakhstan and Serbia would not take part after participating in the previous contest.

Sophie Lennon, who represented Ireland in the previous edition of Junior Eurovision, joined Jessica McKean on stage.