The singer put together a crowd-pleasing set list that included tracks from his solo records and a selection of Take That hits.
He even made one fan's dream come true by serenading her on stage, handed over singing duties to the Glasgow Gaelic School choir for a rendition of Sing, the track he wrote with Andrew Lloyd Webber to mark the Queen's Jubilee, and promised to bring Take That to the Hydro next year.
So, after all that, what did the fans think of Barlow's latest Glasgow show?
Karen Chalmers said: "It was amazing. I'm a massive Take That fan and I thought there was a great mix of tracks, I was really impressed."
Victoria Young said: "It was fantastic. Compared to his last tour it was more about him as a solo artist. I'm a die-hard Gary Barlow fan and I love his solo stuff. He gave the crowd what they wanted."
Laura McCann said: "I thought he was brilliant. It was the first time I'd seen him live and he was better than I expected. I wish I'd been picked to go up on stage by him, I was so jealous."
Michael Ballingall, who saw Barlow live at the Armadillo last year, said: "He was really good. it's my first time in the Hydro and I was very impressed, it was a great venue for him to play."
Vicky Ellis said: "It was fantastic. I had only seen him before before as part of Take That and I've been a follower of his since then. It was a great, well mixed set list. I'm definitely going to be back to see him again."
Leigh Smith said: "It was unbelievable. I saw him last year in Edinburgh and this time was totally different and much more energetic. It was amazing and I'll 100% be going to see him again."