Shortly after the singer thanked wellwishers for their 'overwhelming' support, fans rallied round to to set up the fund with a mission to raise £100,000 for the stillbirth and neonatal death charity, Sands, which provides support for bereaved parents and their families.
Gary's followers were left stunned this week when he announced on Twitter that he and his wife, Dawn, were left heartbroken after their fourth child Poppy's death on August 4.
He wrote: "Dawn and I are devastated to announce that we've lost our baby. Poppy Barlow was delivered stillborn on August 4th in London. Our focus now is giving her a beautiful funeral and loving our three children with all our hearts. We'd ask at this painful time that our privacy be respected."
The donation page for the new fund has been posted on the charity website JustGiving.com/RIPPoppyBarlow.
Fan Michelle Pierce, who set up the page, wrote: "I'm raising money for Sands, the stillbirth and neonatal death charity because as a mark of respect and to raise awareness.
"As fans and many of us as parents we all want to show love and support to the Barlow family. Here we can make a difference, and leave united messages of love and support. This is a united donation from all Gary Barlow and TT fans."