It will be the most comprehensive redevelopment of the Victorian building since it opened as a theatre in 1878 with works due to commence on site this September.
The Category B listed building, will close in the summer and re-open in late 2020.
Judith Kilvington, Executive Director of Citizens Theatre, said: “This appointment marks the next phase in our Redevelopment Project.
“Kier has a wealth of experience in delivering theatre and heritage projects and it’s hugely exciting to be welcoming them to the team, led by architects Bennetts Associates, to realise our vision for the Citizens Theatre.
“Kier will work alongside Citizens Theatre and our Design Team in achieving the Second Stage tender and will then go on to carry out the required building work to overhaul our Victorian home – alongside overseeing the demolition of our foyer and back offices to make way for a new wing, including a new studio theatre and learning spaces.”
Brian McQuade, Kier Construction Scotland and North East managing director, said: “We’re delighted to restore, improve and protect the iconic Citizens Theatre.
“This builds on our solid record of working on major heritage projects, including The Mackintosh Building at Glasgow School of Art, Edinburgh College of Art, Aberdeen Music Hall and most recently, The Burrell Collection.
“As with all the work we carry out, we will provide jobs for the local community by working with our supply chain to offer a range of diverse employment and training opportunities throughout this exciting project. “