Marcus Porcius Cato Uticensis (95 BC, Rome – April 46 BC, Utica), commonly known as Cato the Younger (Cato Minor) to distinguish him from his great-grandfather (Cato the Elder), was a politician and statesman in the late Roman Republic, and a follower of the Stoic philosophy. A noted orator, he is remembered for his stubbornness and tenacity (especially in his lengthy conflict with Julius Caesar), as well as his immunity to bribes, his moral integrity, and his famous distaste for the ubiquitous corruption of the period.

Cato was born in 95 BC in Rome, the son of Marcus Porcius Cato and his wife Livia Drusa. His parents died when he was young, and he was cared for by his maternal uncle Marcus Livius Drusus, who also looked after Quintus Servilius Caepio, Servilia Caepionis Maior, and Servilia Caepionis Minor from Livia's first marriage (though Quintus Servilius Caepio was generally known to be Cato's full brother), as well as Porcia (Cato's full sister), and Marcus Livius Drusus Claudianus (Livius' adopted son). Drusus was murdered when Cato was 4 years old.