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Look up red-letter in Wiktionary, the free dictionary.
Red letter is an English language idiom that may refer to:
- A red letter day, an important occasion, festival, or anniversary
- A red letter edition, usually of the Bible, with portions of the text written in red ink
- Red-Letter Christians, a movement named for the words attributed to Jesus in red letter editions of the Bible
- Red Letter Media, a film production company