Marcus Ummidius Quadratus Annianus (138–182) was a Roman senator and the nephew of the Emperor Marcus Aurelius. He was involved in an unsuccessful plot to assassinate his cousin the Emperor Commodus, which led to his execution afterwards.
- Occupation
- politician, military personnel
- Position held
- ancient Roman senator, Roman consul
- Citizenship
- Ancient Rome
- Born
- 138
- Died
- 182