The Roman Catholic Archdiocese of Arusha (Latin: Archidioecesis Arushaënsis) is the Metropolitan See for the ecclesiastical province of Arusha in Tanzania.

According to history, evangelisation in Arusha started in July 15, 1926 when Holy Ghost Fathers Missionaries from Kilimanjaro were invited to visit Arusha.

At that moment Arusha was the part of Kilimanjaro Vicariate.

These priests arrived in Arusha and opened Mission in an area known as Mesopotamia.The Mission centre of Mesopotamia was developed slowly into a Parish, which is known as St Theresa of Child Jesus Parish.

[1] The seat of the archbishop is St. Theresa’s Metropolitan Cathedral in Arusha.