Marcus Considius Nonianus was a praetor in the late Roman Republic, holding the office around 55–50 BC. In 49 BC, as civil war was breaking out, the senate assigned him as propraetor to succeed Julius Caesar in the province of Cisalpine Gaul. He served in Campania.
A denarius, notable for its unique depiction of Venus Erycina, was minted by his contemporary C. Considius Longus (or Paetus) but is sometimes misattributed to him.