The United Church of Christ in Japan (UCCJ) is a vibrant network of approximately 1,650 Protestant churches and preaching places throughout Japan. Established in 1872, the UCCJ operates across 17 districts, ranging from Hokkaido to Okinawa, with a mission centered on sharing the gospel through worship, Bible study, and community prayer meetings. This collective emerged from a diverse array of Protestant denominations, uniting under a common faith confession during a pivotal moment in Japanese history in 1941.

Recognized as the largest Protestant denomination in Japan, with around 160,000 members and 3,200 ministers, the UCCJ plays a crucial role in both spiritual and social developments. Its churches engage in varied activities such as Sunday schools, missionary education, and social welfare programs, significantly influencing Japan's modernization efforts. The UCCJ also fosters global connections, collaborating with international churches to promote cross-cultural exchange and missionary work. Worship services are inclusive and inspire congregants through traditional elements like hymn singing, scripture readings, and sacraments, creating a rich communal experience of faith.