The singer has written a track for his mother Pattie Mallette and plans to make it available on May 13 to coincide with Mother's Day in North America.
Bieber told MTV: "I wrote a song for my mum. But I'm going to put it out on Mother's Day.
"[It's] about the struggles, I say in the song. She had me at like the age I am now. [It's about] just the struggles she went through and how brave she was, and I think the world needed to know that."
Bieber maintained that he will release the song whether it makes the final tracklist for his new album Believe or not.
Believe will be released in the UK on June 18 and the US on June 19.
Watch the music video for Justin Bieber's current single 'Boyfriend' below: