| Otto I | |
|---|---|
| Margrave of Brandenburg | |
| Reign | 1170–1184 |
| Predecessor | Albert the Bear |
| Successor | Otto II |
| Born | c. 1128 |
| Died | July 8, 1184 |
| Burial | |
| Spouse | Judith of Poland Ada of Holland |
| Issue | Otto II, Margrave of Brandenburg Henry, Count of Tangermünde and Gardelegen Albert II, Margrave of Brandenburg |
| House | House of Ascania |
| Father | Albert the Bear |
| Mother | Sophie of Winzenburg |
Otto I (c. 1128 – July 8, 1184) was the second Margrave of Brandenburg, from 1170 until his death.