The diocese was established on November 8, 1984, carved out from the Diocese of Mwanza. The cathedral was built in 2010 and dedicated to the Blessed Virgin Mary, Queen of Peace.
Catholic evangelization in Geita began under the Diocese of Mwanza. Missionaries worked to spread the Gospel, establish schools, and provide healthcare. Over time, the growing Catholic community led to the creation of the Diocese of Geita. Evangelization focused on both spiritual formation and social development, including education, healthcare, and community outreach. Missionary influence, especially by figures like Charles Cardinal Lavigerie, played a key role. Today, the diocese continues to expand through parish activities, catechesis, and service to the local population.
The current bishop is Rt. Rev. Flavian Matindi Kassala, appointed by Pope Francis on April 28, 2016. Born in 1967, he was ordained a priest in 1999 and previously served in education and seminary leadership roles before becoming bishop.
The Diocese of Geita is a Roman Catholic diocese in northwestern Tanzania, part of the Ecclesiastical Province of Mwanza. It covers 10,697 km² and serves a Catholic population of about 232,000 across 15 parishes. The diocesan cathedral is the Cathedral of Mary Queen of Peace in Geita Town.
