The 2021 season was the 49th season in the existence of Júbilo Iwata and the club's second consecutive season in the second division of Japanese football.

As of 14 July 2021[1] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.