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.
Between 1684 and 1688 he was the Superintendent of Livonia. Upon his father's death in 1690, he was appointed his successor in Turku. During his time as Bishop of Turlku, Gezelius published a hymnal that had been edited by Erik Cajanus. It was later commonly called the Old Hymnal (Finnish: Vanha virsikirja) and was based on a Swedish hymnal from 1695.[1]