Joachim I.
Joachim I. is the name of the following people:
- Joachim I (Constantinople) († 1504), Patriarch of Constantinople
- Joachim I (Brandenburg) (1484–1535), Elector of Brandenburg and Arch Chamberlain
- Joachim I von Alvensleben (1514–1588), German scholar and reformer, lord of the castle in Erxleben
- Joachim I. (1744–1810), Austrian clergyman and abbot of St. Lambrecht, see Joachim Röck