GQ hailed the 19-year-old as a role model and praised Church for her efforts to take her voice, dubbed by critics as angelic, into a harder, more rock-star style.
"Charlotte Church is our woman of the year simply because she is larger than life. She is a great singer, a tabloid giant and enjoys life to the full," said GQ editor Dylan Jones.
After four albums of classical music and opera, Church released her first pop recording, "Tissues and Issues," this year.
Rapper Jay-Z was named international man of the year.
Pierce Brosnan picked up the editor's special award. The lifetime achievement award went to Bryan Ferry of Roxy Music and the outstanding contribution award went to Bob Geldof.
The awards ceremony was held at the Royal Opera House in Covent Garden and hosted by Rory Bremner.