The 30-year-old singer will release 'Fly' in support of the Special Olympics World Games later this year after co-writing the track with husband Chad Kroeger and David Hodges, reported Digital Spy.
The track will also help to raise money for The Avril Foundation, a charity set up by the star to support young people with disabilities and life-threatening illnesses.
"I wrote FLY for Avril Foundation a while ago. I'm excited to share it soon to support Special Olympics!," Lavigne tweeted.
Lavigne is currently working on her sixth studio album, which will serve as the follow-up to her 2013 self-titled collection.