This glossary of Protestantism provides definitions of terms related to Protestantism, with links to full articles where available.
- Christian denominational family characterized by rejection of infant baptism.
- A tradition within Protestant Christianity emphasizing active evangelism, personal conversion and faith experiences, and Scripture as the sole basis for theology and practice.
- One of the largest Protestant Christian denominations, based on the teachings of Martin Luther in the 1500s.
- sola fide
- (Latin, "faith alone"). Martin Luther's doctrine that faith is all that is necessary for salvation. It remains a core doctrine for many Protestants today.