Iwobi started as a youth international for England, with whom he won the 2011 Victory Shield.
Iwobi went on though to play for Nigeria.
He made his senior debut for the Super Eagles on 8 October 2015, replacing Ahmed Musa in the 57th minute of a 2–0 friendly defeat to DR Congo in Visé, Belgium.

He was selected by Nigeria for their 35-man provisional squad for the 2016 Summer Olympics.
He was not a part of the 18-man final squad.

In August 2017 Iwobi pulled out of Nigeria's squad for that month's World Cup qualifiers due to injury.
In October 2017, Iwobi scored for Nigeria in a 1–0 win over Zambia to secure the Super Eagles a spot in the 2018 FIFA World Cup in Russia.
He was named in Nigeria's 23-man squad for the competition and featured in all three games as the Super Eagles were knocked out in the group stage.

In April 2019, he said he wanted to emulate his uncle Jay-Jay Okocha by winning the Africa Cup of Nations.
He was included in Nigeria's squad for the 2019 tournament.
At the tournament he said he would ignore the labelling of Nigeria as favourites.
After the tournament he said he was looking forward to returning to club football with Arsenal.
Iwobi started as a youth international for England, with whom he won the 2011 Victory Shield. Iwobi went on though to play for Nigeria. He made his senior debut for the Super Eagles on 8 October 2015, replacing Ahmed Musa in the 57th minute of a 2–0 friendly defeat to DR Congo in Visé, Belgium.
He was selected by Nigeria for their 35-man provisional squad for the 2016 Summer Olympics. He was not a part of the 18-man final squad.
In August 2017 Iwobi pulled out of Nigeria's squad for that month's World Cup qualifiers due to injury. In October 2017, Iwobi scored for Nigeria in a 1–0 win over Zambia to secure the Super Eagles a spot in the 2018 FIFA World Cup in Russia. He was named in Nigeria's 23-man squad for the competition and featured in all three games as the Super Eagles were knocked out in the group stage.
In April 2019, he said he wanted to emulate his uncle Jay-Jay Okocha by winning the Africa Cup of Nations. He was included in Nigeria's squad for the 2019 tournament. At the tournament he said he would ignore the labelling of Nigeria as favourites. After the tournament he said he was looking forward to returning to club football with Arsenal.
Alex Iwobi