Lacazette has featured for all of France's national youth teams beginning with the under-16 team making his debut in the team's 2–0 victory over Cameroon on 3 April 2007 at the Montaigu Tournament.
He finished the campaign with four appearances in the tournament.
With the under-17 team, Lacazette was a regular and contributed to the team's qualification for the 2008 UEFA European Under-17 Football Championship.
In the competition, he scored the game-winning goal in the team's 2–1 win over the Republic of Ireland in the group stage.
France later reached the final where the team was defeated 4–0 by Spain.

With the under-18 team, Lacazette made his debut in the team's match against Ukraine.
He featured in ten of the eleven matches the team contested scoring one goal, which came against Denmark in the Tournoi de Limoges.
For under-19 duty, Lacazette was again called upon by coach Francis Smerecki, making his first appearance for the team in a 4–2 defeat against Netherlands on 9 November 2009.
He scored his first goal for the team on 4 March 2010 in a 2–1 win against Ukraine.
On 7 June 2010, Lacazette was named to coach Smerecki's 18-man squad to participate in the 2010 UEFA European Under-19 Championship.
In the tournament, he scored two goals in the team's 5–0 Group A victory over Austria.
France later reached the final where they faced Spain, which was essentially composed of the same players that defeated France in the 2008 UEFA European Under-17 Football Championship final.
In the match, France came back from a goal down to win 2–1 with Lacazette netting the game-winning goal in the 85th minute after heading in a cross from Gaël Kakuta.
France thus secured their second UEFA European Under-19 championship title.

Due to France's victory at the 2010 UEFA European Under-19 championship, the nation qualified for the 2011 FIFA U-20 World Cup.
This resulted in Lacazette making appearances for the under-20 team.
He made his under-20 team debut on 7 October 2010 in a friendly match against Portugal.
The match ended 3–3 with Lacazette scoring the opening goal of the match.
Three days later, Lacazette scored a double in the team's 5–0 thrashing of the Juventus Primavera team.
The match was unofficial and was contested as part of the celebration of the Treaty of Turin.
On 9 February 2011, Lacazette scored the game-winning goal in a 2–1 victory over England.
In March 2011, Lacazette scored goals in back-to-back matches against Peru.

On 10 June 2011, he was named to the 21-man squad to participate in the 2011 FIFA U-20 World Cup finals.
He made his debut in the competition in France's first Group A match on 30 July 2011 against the host nation Colombia (France lost the match 4–1), appearing as a substitute.
In the team's next Group A match against South Korea, Lacazette appeared as a substitute again and scored the final goal (in second-half injury time) of the match, which France won 3–1.
He scored one goal in France's final Group A match, 2–0 win over Mali.
Lacazette scored twice in the quarterfinal win over Nigeria and one goal in the third place match against Mexico.
He finished as the tournament's joint top scorer with 5 goals, along with Henrique Almeida and Álvaro Vázquez.
Lacazette has featured for all of France's national youth teams beginning with the under-16 team making his debut in the team's 2–0 victory over Cameroon on 3 April 2007 at the Montaigu Tournament. He finished the campaign with four appearances in the tournament. With the under-17 team, Lacazette was a regular and contributed to the team's qualification for the 2008 UEFA European Under-17 Football Championship. In the competition, he scored the game-winning goal in the team's 2–1 win over the Republic of Ireland in the group stage. France later reached the final where the team was defeated 4–0 by Spain.
With the under-18 team, Lacazette made his debut in the team's match against Ukraine. He featured in ten of the eleven matches the team contested scoring one goal, which came against Denmark in the Tournoi de Limoges. For under-19 duty, Lacazette was again called upon by coach Francis Smerecki, making his first appearance for the team in a 4–2 defeat against Netherlands on 9 November 2009. He scored his first goal for the team on 4 March 2010 in a 2–1 win against Ukraine. On 7 June 2010, Lacazette was named to coach Smerecki's 18-man squad to participate in the 2010 UEFA European Under-19 Championship. In the tournament, he scored two goals in the team's 5–0 Group A victory over Austria. France later reached the final where they faced Spain, which was essentially composed of the same players that defeated France in the 2008 UEFA European Under-17 Football Championship final. In the match, France came back from a goal down to win 2–1 with Lacazette netting the game-winning goal in the 85th minute after heading in a cross from Gaël Kakuta. France thus secured their second UEFA European Under-19 championship title.
Due to France's victory at the 2010 UEFA European Under-19 championship, the nation qualified for the 2011 FIFA U-20 World Cup. This resulted in Lacazette making appearances for the under-20 team. He made his under-20 team debut on 7 October 2010 in a friendly match against Portugal. The match ended 3–3 with Lacazette scoring the opening goal of the match. Three days later, Lacazette scored a double in the team's 5–0 thrashing of the Juventus Primavera team. The match was unofficial and was contested as part of the celebration of the Treaty of Turin. On 9 February 2011, Lacazette scored the game-winning goal in a 2–1 victory over England. In March 2011, Lacazette scored goals in back-to-back matches against Peru.
On 10 June 2011, he was named to the 21-man squad to participate in the 2011 FIFA U-20 World Cup finals. He made his debut in the competition in France's first Group A match on 30 July 2011 against the host nation Colombia (France lost the match 4–1), appearing as a substitute. In the team's next Group A match against South Korea, Lacazette appeared as a substitute again and scored the final goal (in second-half injury time) of the match, which France won 3–1. He scored one goal in France's final Group A match, 2–0 win over Mali. Lacazette scored twice in the quarterfinal win over Nigeria and one goal in the third place match against Mexico. He finished as the tournament's joint top scorer with 5 goals, along with Henrique Almeida and Álvaro Vázquez.
Alexandre Lacazette