The report, issued today by the New York-based Committee to Protect Journalists, focuses on the 10 most censored countries.
It says Karimov's regime uses an informal system of state censorship to prevent the media from reporting on widespread police torture, poverty, and an Islamic opposition movement.
The report also says Uzbekistan is the former Soviet republic with the most journalists in jail at the end of 2005.
The report was issued to mark World Press Fredom Day on May 3.
Aftermath Of Andijon
A dedicated webpage bringing together all of RFE/RL's coverage of the events in Andijon, Uzbekistan, in May 2005 and their continuing repercussions.