K.O. 3an Guo (traditional Chinese: 終極三國; simplified Chinese: 终极三国; pinyin: Zhōng Jí Sān Guó) is a Taiwanese television series starring George Hu, Xiu, Kirsten Ren, and three out of four members of Fahrenheit as special guests, who starred in the prequels. The title is pronounced as K.O.-san-guo. It is the third installment of the Zhong Ji series; preceded by KO One and The X-Family. This series is a spoof of the 14th century Chinese historical novel Romance of the Three Kingdoms by Luo Guanzhong.

The series started filming on 24 December 2008 and wrapped on 21 January 2010. It was first broadcast in Taiwan on free-to-air Formosa Television (FTV) from 27 February 2009 to 26 February 2010 on Fridays at 22:00 and on cable TV Gala Television (GTV) Variety Show/CH 28 from 28 February 2009 to 27 February 2010 on Saturdays at 23:00.