Orso I Participazio | |
|---|---|
 Orso returns in triumph from his victory against the Slavic pirates, drawing by Giuseppe Lorenzo Gatteri | |
| 14th Doge of Venice | |
| In office 864–881 | |
| Preceded by | Pietro Tradonico |
| Succeeded by | Giovanni II Participazio |
| Personal details | |
| Born | Unknown |
| Died | 881 |
Orso I Participazio (Latin: Ursus Particiacus; died 881), also known as Orso I Badoer, was Doge of Venice from 864 until 881. He was, according to tradition, the fourteenth doge, though historically he is only the twelfth.