The U.S. Commission on International Religious Freedom says, in its annual report to Congress, that many Asian countries still curtail the religious freedoms.
It says that in China, the government continues to commit "egregious violations" against many religious or spiritual groups, including Christians, Buddhists, Muslims and the Falun Gong.
The commission says North Korean officials have imprisoned and sometimes executed citizens who take part in unauthorized religious activities.
It says Burma has persistently discriminated against members of minority religious groups.
And in Vietnam, the report says key religious dissidents remain imprisoned or under house arrest.