* The Catholic Church hierarchy: The Inquisition was under direct control of the Church and was seen as a necessary tool to preserve the purity of the Catholic faith and the power of the Church in Spanish society.
* The Spanish monarchy: The monarchs of Spain, particularly Isabella and Ferdinand, supported the Inquisition as a means to unify their kingdoms and consolidate their religious and political power.
* The Spanish nobility and upper class: Many members of the Spanish nobility and upper class supported the Inquisition as a way to maintain social order and to suppress any potential challenges to their privileges.
* The Spanish people: Many ordinary Spaniards supported the Inquisition as a means to protect their communities from religious error and to maintain the dominance of Catholicism.
The Spanish Inquisition was a controversial and repressive institution but it did enjoy significant support from a broad cross-section of Spanish society at the time.