The Kzinti government was the governing body of a feline humanoid species called the Kzinti. It was lead by the Highest of Kzin.
In the mid-21st century, the Kzinti became involved in a series of conflicts with the newly warp-capable Earth, and were defeated. (TAS: "The Slaver Weapon").
In Larry Niven's Known Space Universe the Kzinti government was named "Kzinti Patriarchy". After the defeat by Human forces it was stripped down to twelve star systems by the Treaty of Sirius.