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Dietrich of Oldenburg | |
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| Count of Oldenburg | |
| Predecessor | Christian V of Oldenburg |
| Successor | Christian VII |
| Born | c. 1398 |
| Died | 14 February 1440 (aged 41–42) Delmenhorst,Germany |
| Buried | Roskilde Cathedral, Roskilde, Denmark |
| Noble family | House of Oldenburg |
| Spouse(s) | Countess Adelheid of Oldenburg-Delmenhorst Hedvig of Holstein |
| Issue | Christian I of Denmark Maurice V of Delmenhorst Gerhard VI, Count of Oldenburg Adelheid, Countess of Hohenstein and Mansfeld |
| Father | Christian V, Count of Oldenburg |
| Mother | Countess Agnes of Honstein |
Dietrich or Theoderic of Oldenburg (c. 1398 – 14 February 1440) was a feudal lord in Northern Germany, holding the counties of Delmenhorst and Oldenburg. He was called "Fortunatus", as he was able to secure Delmenhorst for his branch of the Oldenburgs.
Dietrich was the father of Christian I of Denmark, who would go on to start the current dynasty of the Danish throne.