Aristidis of Athens was a second-century Greek philosopher and Christian author who lived in Athens. He is primarily recognized for composing the *Apology of Aristides*, which serves as the oldest surviving Christian apologetic work from that era. Historical accounts from the fourth century, including those by Eusebius and Jerome, suggest he dedicated his defense of the faith to the Roman Emperor Hadrian. His writings reflect his transition from classical philosophy to Christian belief, characterizing the Christian life through virtues such as humility and kindness.