Johannes Gezelius the younger (6 September 1647–10 April 1718), also known as Johannes Gezelius den yngre in Swedish and Johannes Gezelius nuorempi in Finnish, was a theologian, professor at the Royal Academy of Åbo and Bishop of Turku between 1690 and 1718.

His own son, Johannes Gezelius the youngest, was bishop of Porvoo.

In 1670 Gezelius left to study in Germany, England and France against his father's wishes.

He studied in Oxford under the direction of Edward Pococke.

During his time as Bishop of Turlku, Gezelius published a hymnal that had been edited by Erik Cajanus.