The former Edinburgh loosehead is returning north after three seasons at London Irish and will join up with his new team-mates for the start of pre-season training next week.
The club said the search for a replacement for Wilson was “ongoing” and that further recruitment would be overseen by the new coach
Dell, who played for the British & Irish Lions on the 2017 tour of New Zealand, will add experience to the front row and challenge Jamie Bhatti and Oli Kebble for the No 1 jersey.
Originally from South Africa who he represented at under-20 level, the 30-year-old qualifies for Scotland through his grandmother.
“I’m excited to get stuck into life in Glasgow,” Dell told the Warriors website.
“It’s a good group of boys here, and it’s always been a club that’s played an attractive brand of rugby. To come back to Scotland and be a part of that is a really exciting prospect.
“My gran is originally from Paisley, too, so there’s a really nice family feel to coming back north and pulling on the Glasgow shirt.
“There’s a really good crop of guys in the front row here, too – Jamie [Bhatti], Oli [Kebble] Simon [Berghan] and Zander [Fagerson] I obviously know from Scotland camp, but even guys like Nathan McBeth and Murphy Walker are really talented young props. The good thing is that we’ll all push each other and challenge each other to get better, which can only be good for the club overall.”
Al Dickinson, the Glasgow Warriors scrum coach, said: “We’re excited to add Allan to our squad ahead of the new season.
“He’s a loose-head who has proven he can perform at the highest level, and adds to the quality and depth of the props we already have at Scotstoun.”