Folding knife
Objects - Weapons | Robert J. Lang |  Fun Origami World by Makoto Yamaguchi (read full review)
| 74 | Square | |
Knife
Food | Makoto Yamaguchi |  Cute Origami Dollhouse by Makoto Yamaguchi
| 222 | Rectangle - 1X4 | |
Knife & fork holder
Food | Makoto Yamaguchi |  Four Seasons Origami Encyclopedia by Makoto Yamaguchi
| 72 | Square | |
Knife & fork holder
Food | Makoto Yamaguchi |  Let's Enjoy Origami in English and Japanese by Makoto Yamaguchi
| 104 | Square | |
Knifejaw
Fish | Nakamura Kaede |  Origami Aquarium by Makoto Yamaguchi
| 51 | Square | 
Folded by Marjan Smeijsters |
Square box: Windmill, Ninja Throwing Knife
Boxes and Containers | Makoto Yamaguchi |  Origami Tanteidan Magazine 120 (read full review)
| 8 | Rectangle - 1X2
8 units
With lid variations | |
Swiss army knife
Objects - Various | Jun Maekawa |  The Graceful of Origami by Makoto Yamaguchi
| 157 | Square | 
Folded by Gilad Aharoni |
Throwing knife
Toys | Traditional |  Cute Animal Origami by Makoto Yamaguchi
| 196 | Square
2 units | |
Throwing-knife
Toys | Traditional |  Folding Japan with Origami in English by Makoto Yamaguchi
| 182 | Square
2 units | |
