Athenagoras of Athens was a Christian philosopher and writer in the second half of the 2nd century CE, during the Roman Empire. He is traditionally thought to have been a convert from Platonism, and his precise dates are unknown. His works are generally dated to the period between 176 and 180 CE, addressed to the emperors Marcus Aurelius and Commodus. Little is known about his personal life, and an alternative identification of him as a school head in Alexandria is considered doubtful by modern scholars.

Two of his works survive. His A Plea for the Christians is a formal defense addressed to the Roman emperors, arguing against common accusations leveled at Christians, such as atheism and immorality. His other treatise, On the Resurrection of the Dead, is a philosophical argument for the possibility of bodily resurrection.

According to modern scholars, Athenagoras represents a significant moment in early Christian thought for his sophisticated use of Greek philosophy, particularly Platonic ideas, to explain and defend Christian doctrine to an educated pagan audience. His writing is noted for its respectful and reasoned tone. While his immediate historical influence is unclear due to the limited survival of his texts, he is valued today as an important example of the intellectual dialogue between early Christianity and Greco-Roman philosophy.