Zero Tolerance Knives (ZT Knives) is a knife brand of Kai USA, headquartered in Tualatin, Oregon, United States.

[2] The original line of ZT knives included collaborations between custom knifemaker Ken Onion and Strider Knives.

[5] All ZT products are manufactured in Kai USA's Tualatin, Oregon facility.

[1][5] Over the course of the brand's history, eight individual Zero Tolerance knives have won awards at the annual Blade Show in Atlanta, Georgia.

[1][3] The brand has worked with custom knife makers such as Les George, Jens Anso, Dmitry Sinkevich, Todd Rexford, Rick Hinderer, R.J. Martin, Tim Galyean, Grant and Gavin Hawk, Ken Onion, and Gus T.