John B. Cooke III is an American politician who served in the Colorado Senate from the 13th district as a member of the Republican Party.

Cooke was born in San Juan, Puerto Rico, and educated at Arvada West High School and the University of Northern Colorado.

[4] The American Civil Liberties Union sued Weld County after Cooke and District Attorney Ken Buck seized the income tax records of a preparer who served thousands of Latino residents in Greeley.

Cooke and Buck stated that the records were taken as they claimed that around 1,300 illegal immigrants filed tax returns using false or stolen identities.

District Judge James Hiatt ruled in favor of the ACLU, stating that the search conducted by Buck and Cooke was illegal as the federal law made the records confidential.

[17] Cooke proposed legislation in the state senate that would repeal Colorado's fifteen-round limit on ammunition magazines.