Otto of Tonengo was an Italian papal diplomat and cardinal, first as deacon of San Nicola in Carcere from 1227 and then as bishop of Porto e Santa Rufina from 1244.
- Occupation
- diplomat, Catholic priest, Catholic bishop
- Position held
- cardinal-bishop, cardinal-deacon, canon, cardinal
- Born
- 1190
- Died
- 1251, 1250
