Julius Joseph Dinder (9 March 1830 - 30 May 1890) was a German Bishop of the Roman Catholic Church, and Archbishop of Poznań and Gniezno, and the Primate of Poland in the years 1886- 1890.

He studied Theology in the Lycaeum Hosianum in Braunsberg and was ordained on June 8, 1856. he was a vicar in Bischofsburg, then a pastor in Grieslienen, working among Ermland's / Warmian Catholics, where he learned the Polish language.

In 1868, he was made a pastor of the parish in Königsberg in Prussia, ranked provost at the provostry church there, and was appointed Dean of Samland, and honorary canon of Ermland.

His rise to the office was at the promotion of Otto von Bismarck, who wanted a German in the role, as part of his Germanisation-politics.

"Kurier Poznański" wrote of him "everything you did, had a sense of Justice and kindness, which indeered him in hearts and minds".