A letter box is a receptacle for receiving mail.
Letterbox may also refer to:
- Distribution of advertising mail by letter box drop
 - Letterboxing (filming), the practice of transferring film shot in a widescreen aspect ratio to standard-width, resulting in a letterbox
 - Letterboxing (hobby), outdoor orienteering game
 - Letter Box (TV series), a 1962 Australian game show
 - "Letterbox", a song by They Might Be Giants from their 1990 album Flood
 - Letterbox, a 2017 album by Marie Miller
 - Letterboxing, a method which mitigates Internet tracking by screen size
 
See also
- Letterboxd, a social networking site for films
 - Party Time (TV series), an Australian game show
 
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