Lucius Calpurnius Piso Caesoninus (c. 100 BC – 43 BC) was a Roman  and the father-in-law of Julius Caesar through his daughter Calpurnia Pisonis. He also had a son, Lucius Calpurnius Piso, known as "the Pontifex", who was Consul in 15 BC. He was reportedly a follower of a school of Epicureanism that had been modified to befit politicians, as Epicureanism itself favored withdrawal from politics.