Minister functions in many Protestant traditions, particularly Reformed, Presbyterian, Methodist and various British and Commonwealth churches, as the standard formal title for an ordained clergy member, roughly interchangeable with pastor in everyday American usage but carrying a somewhat more institutional, denominationally credentialed connotation in traditions where ordination proceeds through a formal ecclesiastical body, a presbytery in Presbyterian polity or a conference in Methodist polity, rather than through congregational calling alone. A minister in these traditions is typically ordained only after completing a defined process of theological education and examination set by the denomination itself, and remains, even while serving a specific congregation, formally accountable to that wider denominational body for standing and discipline in a way a purely congregationally called pastor in an independent church may not be.
British English usage in particular favors minister over pastor across most Protestant denominations, reserving pastor more for informal or specifically evangelical and free-church contexts, a usage difference reflecting each term's differing historical roots: minister emphasizes the office as one of service, from the Latin minister, servant, administered through a formal ecclesiastical structure, while pastor emphasizes the more personal, biblical shepherd imagery a congregation directly calls to lead it.