text: Open letter, a public letter as distinguished from private correspondence
  Letter to the editor, a letter sent to a newspaper, magazine, or online publication by one of its readers and meant to be published
  Encyclical letter in the Catholic Church
  Apostolic letter (litterae apostolicae), a type of ecclesiastical letter in the Catholic Church
  Letter (paper size), paper conventionally sized for letter-writing
  Education
  Letters, an obsolete synecdoche for literacy; e.g. "He knows his letters"
  Literature as in Letters, Arts and Sciences
  Varsity letter, an award given in the U.S. for interscholastic or intercollegiate merit in a sport or other activity such as band or orchestra
  Music
  Letters (Bish album), 2020
  Letters (Matt Cardle album), 2011
  Letters (Butch Walker album), 2004
  Letters (Jimmy Webb album), 1972
  "Letters" (Monica song), 2023
  "Letters" (Frank Turner song), 2024
  "Letters" (Hikaru Utada song), 2002
  Places
  Letters, Ross-shire, a small village on the coast of Loch Broom, Scotland
  Letter railway station in Germany
  Letter, a townland in Kilcar, County Donegal, Ireland
  People
  Douglas Letter, American lawyer and general counsel
  Stephan Letter (born 1978), German serial killer
  Other uses
  LETTERS, an 1979 novel by John Barth
  John Letters, a Scottish manufacturer of golf clubs
  Letters (sculpture), a 1915 work by Charles Keck