The CPJ said that prominent Yemeni journalist Afrah Nasser may not be able to attend the November 15 ceremony to receive the International Free Press Award.
The Trump administration in September announced the most recent iteration of the US travel ban, which include restrictions on Yemeni citizens.
Nasser, who is also a citizen of Sweden where she now resides, wrote on her blog on Friday that she had applied twice and was rejected both times by the American embassy in Stockholm.
"I am currently applying for the third time, and I am not optimistic," she wrote.