Johannes Gerhardus Rijk Acquoy (3 January 1829 – 15 December 1896) was a Dutch Protestant theologian and church historian.

Johannes Gerhardus Rijk Acquoy was born in Amsterdam on 3 January 1829,[1] the son of Jacobus Acquoy, a self-taught school headmaster and independent scholar, and his wife Maria van den Berg.

[2] While teaching at the University of Leiden, Acquoy held weekly Privatissimum [de], exclusive small lectures, in which he taught source criticism and sought to instruct his students in character traits such as truthfulness, in order to train them to be future church historians.

Some of his students went on to scholarly work, including Fredrik Pijper [nl; de], who later took over Acquoy's position as Chair of the History of Church and Dogma at the University of Leiden.

[1] At the University of Leiden, Acquoy was close friends with historian Robert Fruin and the two later were buried together in the same grave.