She went missing after the blast at the Ariana Grande show.
I want to adopt, says Subo
Boyle, from Blackburn, West Lothian, believes taking on a child would be a ''way of giving back for me''.
The Sunday Mail newspaper reported the singer as saying: ''I have so much love to give. I want to adopt a child who doesn't have much, who I can really give something to. It's a way of giving back for me.
''I have been considering it for a year. I love children, I always have but I couldn't have them. I want to give a youngster what I didn't have.
''We'll have to see what social services say, but it would make me so happy.''
She added: ''I know I'm single and 50-odd. People don't think I'm serious when I say it, they have a giggle at me. Let's see.''
Boyle, whose sixth album Hope is due out next month, is reported to have seen a relative care for foster children. While the singer said fostering would be ''great'', she added: ''You have to give them back, and that's what I would hate. With adoption, you don't have that wrench.''
Family members say Laura Macintyre and Eilidh MacLeod haven't been heard from since the explosion.
The families of two girls from the Western Isles missing after attending the concert in Manchester targeted in a terror attack have issued appeals on social media.
Crews were called to the former Royal Victoria Hospital site this afternoon.
Most Viewed Pictures On Heart
Recently Played Tracks
To listen live, choose your preferred station:
Now playing: The best feel good music
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Find out more about some of the companies advertising on Heart Scotland- East.