How is the Roman Catholic Church organized from parishes to dioceses?

The organization of the Roman Catholic Church is a complex, hierarchical structure rather than a simple pyramid. At the local level, the church is organized into parishes, which serve as the basic geographic units, each led by a pastor or priest.12

These parishes are grouped into larger territorial units known as dioceses, which are administered by a bishop. A bishop acts as the supreme authority within his diocese, holding executive, legislative, and judicial powers to govern the church in his territory, subject only to the pope. In some cases, dioceses may be further subdivided into rural deaneries, which contain several parishes.43

Only the pope has the authority to create, merge, or divide dioceses. While the bishop manages the diocese with the assistance of a staff known as a curia, the entire global structure is headed by the papacy and the Holy See, which serves as the central government for the church.431