Croatia participated in the Junior Eurovision Song Contest five times, and won the inaugural edition in 2003. Croatian broadcaster Hrvatska radiotelevizija (HRT), a member organisation of the European Broadcasting Union (EBU), were responsible for the country's participation. Croatia participated in the first four editions, from 2003 to 2006, organising a national final to select the country's entrant. The first representative to participate for Croatia was Dino Jelusić with the song "Ti si moja prva ljubav", which finished in first place out of sixteen participating entries, with a score of 134 points. Croatia was absent from the contest between 2007 and 2013, but HRT decided to return to the contest in 2014 and selected their entry internally. In 2014, Josie finished in last place for Croatia with the song "Game Over", after which HRT again withdrew from competing the following year.
The participation of Spain in the Junior Eurovision Song Contest first began at the inaugural Junior Eurovision Song Contest in 2003 which took place in Copenhagen, Denmark. Televisión Española (TVE), a division of Radiotelevisión Española (RTVE) and member of the European Broadcasting Union (EBU), were responsible for the selection process of their participation. Spain used a national selection format, broadcasting a show entitled Eurojunior, for their participation at the contests. The first representative to participate for the nation at the 2003 contest was Sergio with the song "Desde el cielo", which finished in second place out of sixteen participating entries, achieving a score of 125 points. Spain did not participate from 2007 to 2018, but returned to the contest in 2019.
Belarus has participated in the Junior Eurovision Song Contest in every edition since its inception in 2003 until 2020. The Belarusian Television and Radio Company (BTRC), then a member organisation of the European Broadcasting Union (EBU), has been responsible for the selection process of its participants since its debut. The country hosted the contest at the Minsk-Arena in 2010 and again in 2018.
Serbia and Montenegro participated in the Junior Eurovision Song Contest 2005; their only participation during the country's existence. Filip Vučić represented the country with "Ljubav pa fudbal", which finished 13th for the country. Following the country's dissolution in 2006, Serbia continued to participate in the contest, debuting in 2006. Montenegro participated in the 2014 contest.
Armenia has participated in the Junior Eurovision Song Contest since 2007. Armenian Public Television (ARMTV), a member organisation of the European Broadcasting Union (EBU), have been responsible for the selection process of their participants since their debut.
Bulgaria participated in the Junior Eurovision Song Contest for the first time in 2007. Bulgarian National Television (BNT), a member organisation of the European Broadcasting Union (EBU), have been responsible for the selection process of their participants, since their debut in 2007. The first representative to participate for the nation at the 2007 contest was Bon-Bon with the song "Bonbolandiya", which finished in 7th place out of 17 participating entries, achieving a score of 86 points. There has been four absences from the competition, those being in 2009, 2010, 2012 and 2013. Bulgaria's return to the contest in 2014 proved to be successful, when Krisia, Hasan and Ibrahim represented them with the song "Planet of the Children", achieving 147 points and finishing in second place out of 16 participating countries, it compared to Eurovision Song Contest 2017 when the country finished in 2nd place and gained the country's best ever result in a Eurovision competition. They hosted the contest at Arena Armeec in 2015. On 11 June 2016, Lidia Ganeva won the national selection "Decata na Bulgaria sa super", earning the right to represent Bulgaria at the Junior Eurovision Song Contest 2016, in Valletta, Malta. Ganeva performed the internally selected song "Magical Day " at the contest. She received 161 points and therefore finished in 9th place out of 17 participating countries. Their next appearance in the contest was in 2021, where Denislava and Martin achieved the country's worst result to date; 16th place out of 19 participating entries with the song "Voice of Love".
Albania debuted in the Junior Eurovision Song Contest in 2012. Radio Televizioni Shqiptar (RTSH), a member organisation of the European Broadcasting Union (EBU), has been responsible for the selection process of their participants since their debut.
The Junior Eurovision Song Contest 2013 was the 11th edition of the annual Junior Eurovision Song Contest. It took place in Kyiv, Ukraine on 30 November 2013. The venue for the contest was announced on 10 April 2013, as the Palace "Ukraine". Ukrainian broadcaster National Television Company of Ukraine (NTU) was the host broadcaster for the event. It was the second time the contest was held in Kyiv, the first being the 2009 contest. It was also the second time in the history of the Junior Eurovision Song Contest that the event took place in last year's winning country, as well as the first time that the event was held in the same city twice. A total of twelve countries participated, with Macedonia and Malta making a return, and Albania, Belgium and Israel choosing to withdraw. San Marino made their debut in the contest. Cyprus was originally the thirteenth country to take part but pulled out the last minute.
The Junior Eurovision Song Contest 2014 was the 12th edition of the annual Junior Eurovision Song Contest, and took place, for the first time, in Malta. This was the third time that the contest was hosted by the previous year's winning country. Maltese national broadcaster PBS was the host broadcaster for the event. The final took place on 15 November 2014 and was in the Malta Shipbuilding in Marsa, near Valletta. Moira Delia, a Maltese television personality, hosted the show, marking the first time in Junior Eurovision history that there was only one presenter of the show.
The Junior Eurovision Song Contest 2015 was the thirteenth edition of the annual Junior Eurovision Song Contest, and took place, for the first time, in Bulgaria. The Bulgarian national broadcaster BNT was the host broadcaster for the event. The final took place on 21 November 2015 and was held at the Arena Armeec in Sofia. Poli Genova, a Bulgarian singer and former representative of Bulgaria in the Eurovision Song Contest 2011, hosted the show. A total of seventeen countries participated, with Australia and Ireland making their debuts. Albania and Macedonia returned after being absent since the 2012 and 2013 contests, respectively. Croatia and Cyprus withdrew after returning in the 2014 edition, while Sweden withdrew for the first time since 2008.
Malta selected their Junior Eurovision Song Contest 2014 entry through an internal selection like they did the previous year. On 20 April 2014 it was revealed that Federica Falzon would represent Malta in the contest. It was announced on 12 September 2014 that her song would be called "Diamonds".
Cyprus selected their Junior Eurovision Song Contest 2014 entry through an internal selection. On 21 July 2014 it was revealed that Sophia Patsalides would represent Cyprus in the contest with the song "I pio omorfi mera".
Armenia participated in the Junior Eurovision Song Contest 2014 which took place on 15 November 2014, in Marsa, Malta. The Armenian broadcaster Armenia 1 (ARMTV) was responsible for organising their entry for the contest. The Armenian entry was selected through a national final held on 14 September 2014. Betty and her song "People of the Sun" was chosen to represent the nation in Marsa, Malta.
Russia selected their Junior Eurovision Song Contest 2014 entry through an internal selection. On 22 September 2014 it was revealed that Alisa Kozhikina would represent Russia in the contest. On 24 September 2014, it was announced that the name of her song would be "Dreamer".
San Marino selected their Junior Eurovision Song Contest 2014 entry through an internal selection. On 26 September 2014 it was revealed that The Peppermints would represent San Marino in the contest with the song "Breaking My Heart".
Serbia selected their Junior Eurovision Song Contest 2014 entry through an internal selection. On 1 October 2014 it was revealed that Emilija Đonin would represent Serbia in the contest with the song "Svet u mojim očima".
Russia participated in the Junior Eurovision Song Contest 2016 which took place on 20 November 2016, in Valletta, Malta. The Russian broadcaster Russia-1, owned by the All-Russia State Television and Radio Broadcasting Company (VGTRK) was responsible for organising their entry for the contest. Sofia Fisenko won the national final on 16 August 2016 with the song "Zhivaya voda". On 6 October, the Russian organisation team opted to change the name of the entrant to Water of Life Project, with the song also changing to "Water of Life".
North Macedonia participated in the Junior Eurovision Song Contest 2016 which took place on 20 November 2016, in Valletta, Malta, under the provisional reference of "Former Yugoslav Republic of Macedonia". The Macedonian broadcaster Macedonian Radio Television (MRT) was responsible for organising their entry for the contest. Martija Stanojković was internally selected to represent North Macedonia with the song "Love Will Lead Our Way".
Armenia participated in the Junior Eurovision Song Contest 2016 which took place on 20 November 2016, in Valletta, Malta. The Armenian broadcaster Armenian Public Television (ARMTV) was responsible for organising their entry for the contest. Anahit Adamyan and Mary Vardanyan were internally selected to represent Armenia with the song "Tarber".
Cyprus participated in the Junior Eurovision Song Contest 2016 which took place on 20 November 2016, in Valletta, Malta. Cyprus Broadcasting Corporation (CyBC) was responsible for organising their entry for the contest. George Michaelides was internally selected to represent Cyprus with the song "Dance Floor". Cyprus placed 16th with 27 points.
Croatia 
