Stressing that Sheikh Salman should be released immediately, they expressed solidarity with the jailed Bahraini cleric and all other political prisoners in the tiny Persian Gulf country and other parts of the Arab world.
They also regretted the lack of justice in Bahrain and underlined that the Bahraini regime is violating its international commitments by continuing the detention of Sheikh Salman.
The 4th International Human Rights Conference was organized earlier this week by the Bahrain Forum for Human Rights.
The main topic of discussion was the absence of justice in Bahrain and the Al Khalifa regime's violation of its international commitments.
Sheikh Salman was arrested in late December 2014 over alleged anti-regime incitements.
The 49-year-old cleric is charged with "promoting regime change by force, threats, and illegal means, and of insulting the Interior Ministry publicly."
The arrest is part of the Al Khalifa regime's brutal suppression of anti-regime protesters since 2011.
Scores of people have been killed and thousands more wounded during the crackdown. The regime has also detained many protesters.