On 5 October 2013, Jahanbakhsh was called up to Team Melli in a 2015 Asian Cup qualifier against Thailand by manager Carlos Queiroz, and he served his first cap as a substitute in the 82nd minute.
His first national team goal came in his second game on 15 November in a 3–0 win at Thailand.
On 1 June 2014, he was called into Iran's 2014 FIFA World Cup squad by Carlos Queiroz.
He played in all three matches against Nigeria, Argentina and Bosnia and Herzegovina.
He was called into Iran's 2015 AFC Asian Cup squad on 30 December 2014 by Queiroz.

Jahanbakhsh scored Iran's second goal in June 2016 in a 2–0 World Cup qualifier victory against Qatar.

In May 2018, he was named in Iran's squad for the 2018 FIFA World Cup in Russia.
He played all three group matches against Morocco, Spain and Portugal.

In December 2018, Jahanbakhsh was selected for Iran's 23-man squad for the 2019 AFC Asian Cup.
On 16 January 2019, he made his competitive debut in a 0–0 draw against Iraq in the last match of the group stage.
In the latter match, he scored his first goal in the tournament in the 2–0 victory against Oman.
On 5 October 2013, Jahanbakhsh was called up to Team Melli in a 2015 Asian Cup qualifier against Thailand by manager Carlos Queiroz, and he served his first cap as a substitute in the 82nd minute. His first national team goal came in his second game on 15 November in a 3–0 win at Thailand. On 1 June 2014, he was called into Iran's 2014 FIFA World Cup squad by Carlos Queiroz. He played in all three matches against Nigeria, Argentina and Bosnia and Herzegovina. He was called into Iran's 2015 AFC Asian Cup squad on 30 December 2014 by Queiroz.
Jahanbakhsh scored Iran's second goal in June 2016 in a 2–0 World Cup qualifier victory against Qatar.
In May 2018, he was named in Iran's squad for the 2018 FIFA World Cup in Russia. He played all three group matches against Morocco, Spain and Portugal.
In December 2018, Jahanbakhsh was selected for Iran's 23-man squad for the 2019 AFC Asian Cup. On 16 January 2019, he made his competitive debut in a 0–0 draw against Iraq in the last match of the group stage. In the latter match, he scored his first goal in the tournament in the 2–0 victory against Oman.
Alireza Jahanbakhsh