Duplication
- Batman Duplicate
- Body double
- Calvin and Hobbes
- Chromosomal duplication
- Copy (disambiguation)
- Diphallia
- Diprosopus
- Doppelgänger
- Double track
- Doubling the cube
- Duplicate (1998 film)
- Duplicate (2009 film)
- Duplicate Scrabble
- Duplicate bridge
- Duplicate characters in Unicode
- Duplicate code
- Duplicate publication
- Duplicating machines
- Duplication matrix
- Enteric duplication cysts
- File copying
- Gene duplication
- Gregory Harrison
- Kim Greist
- List of duplicating processes
- Loop bin duplicator
- Madeleine Albright
- Polyploidy
- Redundancy (disambiguation)
- Reduplication
- Road
- Symmetry
- The Duplicate
- The Duplicate Man
- We Are the Physics Are OK at Music