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Anthony I, Count of Oldenburg and Delmenhorst (1505 – 22 January 1573 in Oldenburg) was a member of the House of Oldenburg and was the Imperial Count of the Counties of Oldenburg and Delmenhorst within the Holy Roman Empire of German Nation.
His third wife was Countess Antoinette Augusta von Aldenburg (1660-1701), eldest daughter of Anton I, Count von Aldenburg und Knyphausen (by his first wife, Countess Auguste Johanna zu Sayn-Wittgenstein-Hohenstein), legitimated son of Anton Gunther, last of the independent Counts of Oldenburg, who belonged to the Delmenhorst cadet branch of the House of Oldenburg whose senior line became hereditary kings of Denmark.
Maurice (1428–1464); when his elder brother became king, he was given the County of Delmenhorst.
At this time, the county of Delmenhorst formed part of the dominions of the counts of Oldenburg, but afterwards it was on several occasions separated from them to form an appanage for younger branches of the family.