The U15 Boys and Girls will travel to the Eastern European basketball hotbed for a camp and games between Monday 29 May and Thursday 1 June.
And the U14s will follow suit from Thursday 1 June to Sunday 4 June.
Dan Petts and Ruth Eytle will lead the U14 Boys and Girls respectively, while Billy Beddow and Maialen Zilbeti are the U15s Boys and Girls head coaches.
Squads have been named following the recent ETP selection camp and players visiting France and Spain respectively for the Lions Cup and Globasket events.
Activity at the Belgrade camp will consist of practice sessions and informal games against local opposition.
"The Serbia trip offers a unique opportunity for national basketball teams in the age group category to hone their skills through intensive training sessions and competitive games against top-quality opponents.
"With a focus on player development and team building, this trip promises to be a valuable experience for young athletes looking to take their game to the next level."
David Akhidime, Manchester Magic
Shujaa Barnaby, City of Birmingham Rockets
Myles Barry, London Thunder
Oliver Bishop, York Eagles
Luca Boothe, Manchester Magic
Ege Cakmakkaya, Manchester Magic
Ziah Francis, Aquila Basket Trento
Jenson Green, Baltic Stars
Camran Hanson, Manchester Magic
Oscar Mahoney, Teesside Lions
Joshua Mboura, Kingston Wildcats
Samuel Muleba, Milton Keynes Breakers
Kimbe N'Gabala, Richmond Knights
Rufus Wilkinson, Farnborough Phantoms
Head Coach: Dan Petts
Asst Coach: Scott Burchnall
Asst Coach: Charles Vuong
Team Manager: Wayne Brooks
Physio: Javid Mirza
S&C: Aiden Griggs
Kyhanna Campbell, Nottingham Wildcats
Chayana Collins-Foster, Richmond Knights
Precious Godwin, Richmond Knights
Katie Hancock, Sheffield Hatters
Elodie de Jonge, Sevenoaks Suns
Ophelia Larder-Lee, Sheffield Hatters
Mojan Malek, Manchester Mystics
Jane Oboavwoduo, Manchester Mystics
Tanaia Robinson, Ipswich Basketball
Joelle Sealy, London Thunder
Tiana Walker, Manchester Mystics
Anya Williams, Manchester Mystics
Summer Wilson, Sussex Storm
Ella Wright, Sheffield Hatters
Head Coach: Ruth Eytle
Asst Coach: Lewis Scott
Asst Coach: Gemma Salmon
Team Manager: Charlotte Redhead
Physio: Chedell Cruickshank
S&C: Lauren Adams
Emmanuel Ahamefule, London Elite
Kelvin Aigbogun, Manchester Giants
Daniel Banjoko, London Lions
Jakub Bobkowski, Newcastle Eagles
Tristan Curran, Sussex Bears
Ike Davids, Leicester and Loughborough Riders
Fulvio Dos Santos, Baltic Stars
Jeremi Dutka, London Warriors
Jamaul McAllister, Sussex Storm
Huxley Morrell, Sussex Bears
Andrew Nwokolo, London Thunder
Ayomikun Olofintila, Manchester Magic
Oskaras Visocks, Baltic Stars
Emilis Zibuda, Baltic Stars
Head Coach: Billy Beddow
Asst Coach: Mitchell Timmins
Asst Coach: Freddie Winton
Team Manager: Jeron Johnson
Physio: Alex Turvill
S&C Coach: David Baron
Tiarna Chambers-Desmond, Derby Trailblazers
Holly Ensoll, Kingston Lions
Wayet Gore, Manchester Mystics
Anna Idiata Mendez, Team Solent Kestrels
Paige Jagger, Manchester Mystics
Alexandra Mahile, London Lions
Paris Mitchell-Tyson, Oaklands College Wolves
Grace Nzeakor, Leicester and Loughborough Riders
Irene Oboavwoduo, Manchester Mystics
Amelia Orungbeja, London Thunder
Neve Rugette, Richmond Knights
Athena Thompson, Milton Keynes Breakers
Chloe Vella, Richmond Knights
Angel Whyte, Bristol Academy Flyers
Head Coach: Maialen Zilbeti
Asst Coach: Charlie Haynes
Asst Coach: Shanice Turner
Team Manager: Ruchae Walton
Physio: Charlotte Phillips
S&C: Ryan Hemmings