The Omani government said it had evacuated an Australian from Yemen on Wednesday following negotiations through tribal mediators.
The foreign ministry did not name the man and it was not immediately clear if he was Craig McAllister, who was abducted in the rebel-held Yemeni capital Sanaa in September.
The ministry said only that it had acted at the request of the Australian authorities. 
Oman is the only Gulf Arab state that is not part of a Saudi-led coalition that has been battling the Yemeni rebels since March 2015 and it has mediated the release of several Westerners, including an American in November.