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John I, Lord of Mecklenburg | |
|---|---|
 Mecklenburg coats of arms | |
| Born | c. 1211 |
| Died | 1 August 1264 |
| Buried | Doberan Minster |
| Noble family | House of Mecklenburg |
| Spouse(s) | Liutgart of Henneberg |
| Issue | Henry I Albert I Herman Elizabeth Nicholas III Poppo John II |
| Father | Henry Borwin II, Lord of Mecklenburg |
| Mother | Christina of Sweden |
John I, Lord of Mecklenburg, nicknamed the Theologian (c. 1211 – 1 August 1264) was Lord of Mecklenburg from 1234 until his death.