Naitō Julia (内藤 ジュリア, 1566 - 28 March 1627) was a Japanese noble lady and religious leader from the Sengoku period to the early Edo period. Julia was one of the prominent Catholic leaders, along with Kyogoku Maria and others women catechist, who strongly resisted the oppressions imposed on Christianity. She faced the rules of samurai governments, staying true to her missionary campaigns even when Christianity was banned in Japan.