John Dunn Jr. (21 January 1830 – 6 February 1892), the son of John Dunn Sr. was brought into the flour milling partnership with his father in 1852, he resigned in 1862 to work as a Wesleyan missionary in Fiji but was forced by ophthalmia to return in 1864. In January 1865 the Sydney Conference removed his right to the title "Reverend", giving health problems as the reason, and against his wishes, and despite a popular petition, he was removed from the Clarendon circuit in 1865. He was later a lay preacher on the Primitive Methodist circuit.