Strong box or strongbox may refer to:
A type of box Strong box, a strongly built and secured casket (decorative box) Safe, a strongly built and secured metal box
Arts, entertainment, and media "The Strongbox" (1998 TV episode), the 170th episode of Seinfeld The Strongbox Chronicles, a book written as Cate Dermody by C. E. Murphy
Computing and technology Strongbox, the former name of SecureDrop, a secure communications platform
See also Lockbox (disambiguation) Safe (disambiguation) Treasure Box (disambiguation) Treasure chest (disambiguation)