The 26-year-old Australian actor cleared the air regarding his relationship with the singer, telling TV Week in an interview "I am not engaged, no."
Hemsworth and Cyrus were engaged previously before parting ways in 2013. Earlier this year, the couple reunited.
Engagement rumors began when Cyrus was seen in March wearing the diamond ring Hemsworth gave to her when he proposed.
This week, Cyrus and Hemsworth attended the Huntsman: Winter's War premiere together in Los Angeles. Older brother Chris Hemsworth discussed the couple at the premier saying it was "great" to have Cyrus back around.
"It's good getting together with everybody," he said. "We don't see much of each other. We're across the globe -- I'm back in Australia and Liam's here."