• "Letter," in Encyclopædia Britannica (11th ed., 1911)
• "The Letter", a poem by Charlotte Brontë
• "The Letter", a short story by Anton Chekhov
• Letters to friends, by Marcus Tullius Cicero
• "A Letter", a poem by Ralph Waldo Emerson
• "Letters", a poem by Ralph Waldo Emerson
• Letters or Epistles (Registrum Epistolarum) of Pope Gregory I
• A letter, a poem by Adolf Heyduk
• Letters of Jan Hus, collection of letters by Jan Hus
• "The Letter", a poem by Wilfred Owen
• The Letters - Volume I, by Robert Louis Stevenson
• The Letters - Volume II, by Robert Louis Stevenson
• "The Letters", a poem by Alfred Tennyson
• "A Letter", a poem by Frances Fuller Victor
• "The Letter" (1904), a short story by Edith Wharton
• "A Letter", a poem by John Greenleaf Whittier

See also

• Epistles, a variant of "letters" in works translated from other languages
• Portal:Letters, index of letters hosted on Wikisource