The 30-year-old makes the move to Scotstoun with immediate effect, having most recently turned out for Gallagher PREM side Gloucester.
Singleton scored 20 tries in 75 outings for the Cherry and Whites, having joined the Kingsholm outfit in 2020 after previously representing Worcester Warriors and Saracens.
He also enjoyed a season-long loan spell at RC Toulon in the 2023/24 campaign, making 21 appearances, including facing the Warriors at Scotstoun in the Investec Champions Cup pool stages.
Scottish-qualified courtesy of his grandparents, Singleton has earned four caps for England, including an appearance against the USA at the 2019 Rugby World Cup in Japan.
The hooker has recently returned to full training after experiencing a cardiovascular event in training with Gloucester in September 2025 and linked up with the Warriors for the first time at Scotstoun this week.
“It’s been really good so far,” Singleton told glasgowwarriors.org.
“All the lads have been really welcoming, I’m incredibly grateful to be here and I’m looking forward to getting stuck into it with the boys.
“I couldn’t be more pleased to be back in rugby. It’s been a long old year, and for Glasgow to give me this opportunity is something for which I’m incredibly grateful. I’m excited to be in the clear and get back out onto a pitch.
“I watched Glasgow a lot in the Champions Cup last year. I saw that run they went on, and watched them beat Toulouse at home where the atmosphere looked incredible. They play an expansive style of rugby and I know they’re how strong their pack has been for the last couple of years, especially around that driving maul, so I’m looking forward to learning off the lads here and getting involved in that.”
Head Coach Smith added: “With Gregor Hiddleston and Seb Stephen having both made their Scotland debuts over the summer and with both players likely to be involved during the Nations Championship and Guinness Six Nations, Jack brings a wealth of top-flight experience into our environment that will benefit us during those periods.
“He is someone who has already begun to throw himself into becoming a Warrior, and is willing to work hard for his team-mates and his club. He will also provide a positive influence on the development of our three young hookers.
“We are pleased to welcome him into our environment and look forward to working closely with him over the coming months.”