Valančiūnas made his debut for the junior national team of Lithuania in the 2008 FIBA Europe Under-16 Championship in Italy.
He dominated throughout the tournament, averaging 14.3 points, 11.1 rebounds and 2.3 blocks in 23.5 minutes of action.
His team went on to win the gold medal and he was chosen as the MVP.

In the summer of 2009, Valančiūnas participated in the European Under-18 All-Star Game during EuroBasket 2009 in Poland.
He dominated the game as he scored 18 points, grabbed 19 rebounds, blocked three shots and helped the "Blue Team" beat the "White Team" 77–75.
Valančiūnas was later named the MVP of the All-Star game.

One year later, Valančiūnas led Lithuania to another gold medal.
Lithuania dominated in the 2010 FIBA Europe Under-18 Championship held in Lithuania.
Valančiūnas averaged 19.4 points, 13.4 rebounds and 2.7 blocks, and was voted as the MVP.

Valančiūnas was also a member of the Lithuanian Under-19 basketball team, which competed in the 2011 FIBA Under-19 World Cup in Latvia.
He led his team to capture the gold medal, averaging 23.0 points, 13.9 rebounds and 3.2 blocks in 31 minutes of game action.
He was later named the tournament MVP.
Valančiūnas scored 36 points in the gold medal game against Serbia, which was the highest points scored in a game by any player in the tournament.
To this date he is the only player to achieve an MVP and gold medal in all of his FIBA U-tournaments.

Valančiūnas was on the senior men's Lithuanian national basketball team roster for EuroBasket 2011, which took place in Lithuania.
Valančiūnas debuted with Lithuania's senior men's national basketball team on 6 August 2011.
In his debut match against Czech Republic, he scored 26 points and grabbed 11 rebounds.
After a strong performance in friendly pre-EuroBasket 2011 matches, Valančiūnas was leading the Lithuanian national team with 12.3 points and 7.3 rebounds per game.
Although Valančiūnas failed to be any kind of a leader in the first 4 games of EuroBasket 2011 (among them missing the game against Turkey), he then became one of the key players, averaging 8.4 points and 4.1 rebounds in just 15.7 minutes of game action.
He also helped Lithuania to claim the fifth spot, which guaranteed qualification for the 2012 FIBA World Olympic Qualifying Tournament.
To this day, he is the all-time youngest Lithuanian to represent the primary national team at the major tournament.

In 2013, Valančiūnas won a silver medal at the EuroBasket 2013 tournament.
In the 2014 FIBA World Cup, Valančiūnas led the Lithuanian squad, which finished in fourth place.
Valančiūnas was also one of the tournament's best players at EuroBasket 2015, and he was chosen to the All-Tournament Team, along with his Lithuanian teammate, Jonas Mačiulis, after averaging 16 points and 8.4 rebounds per game.
The Lithuanian team won their second consecutive silver medal at the competition.
Valančiūnas made his debut for the junior national team of Lithuania in the 2008 FIBA Europe Under-16 Championship in Italy. He dominated throughout the tournament, averaging 14.3 points, 11.1 rebounds and 2.3 blocks in 23.5 minutes of action. His team went on to win the gold medal and he was chosen as the MVP.
In the summer of 2009, Valančiūnas participated in the European Under-18 All-Star Game during EuroBasket 2009 in Poland. He dominated the game as he scored 18 points, grabbed 19 rebounds, blocked three shots and helped the "Blue Team" beat the "White Team" 77–75. Valančiūnas was later named the MVP of the All-Star game.
One year later, Valančiūnas led Lithuania to another gold medal. Lithuania dominated in the 2010 FIBA Europe Under-18 Championship held in Lithuania. Valančiūnas averaged 19.4 points, 13.4 rebounds and 2.7 blocks, and was voted as the MVP.
Valančiūnas was also a member of the Lithuanian Under-19 basketball team, which competed in the 2011 FIBA Under-19 World Cup in Latvia. He led his team to capture the gold medal, averaging 23.0 points, 13.9 rebounds and 3.2 blocks in 31 minutes of game action. He was later named the tournament MVP. Valančiūnas scored 36 points in the gold medal game against Serbia, which was the highest points scored in a game by any player in the tournament. To this date he is the only player to achieve an MVP and gold medal in all of his FIBA U-tournaments.
Valančiūnas was on the senior men's Lithuanian national basketball team roster for EuroBasket 2011, which took place in Lithuania. Valančiūnas debuted with Lithuania's senior men's national basketball team on 6 August 2011. In his debut match against Czech Republic, he scored 26 points and grabbed 11 rebounds. After a strong performance in friendly pre-EuroBasket 2011 matches, Valančiūnas was leading the Lithuanian national team with 12.3 points and 7.3 rebounds per game. Although Valančiūnas failed to be any kind of a leader in the first 4 games of EuroBasket 2011 (among them missing the game against Turkey), he then became one of the key players, averaging 8.4 points and 4.1 rebounds in just 15.7 minutes of game action. He also helped Lithuania to claim the fifth spot, which guaranteed qualification for the 2012 FIBA World Olympic Qualifying Tournament. To this day, he is the all-time youngest Lithuanian to represent the primary national team at the major tournament.
In 2013, Valančiūnas won a silver medal at the EuroBasket 2013 tournament. In the 2014 FIBA World Cup, Valančiūnas led the Lithuanian squad, which finished in fourth place. Valančiūnas was also one of the tournament's best players at EuroBasket 2015, and he was chosen to the All-Tournament Team, along with his Lithuanian teammate, Jonas Mačiulis, after averaging 16 points and 8.4 rebounds per game. The Lithuanian team won their second consecutive silver medal at the competition.
Jonas Valančiūnas