The contract believed to be worth £15m+ over the next five years will see upgrade work and maintenance carried across Hampshire and Berkshire.
It will include all planned and reactive maintenance to fibre and copper network services.
Throughout the duration of the contract, Kier is committed to providing employment and local supply chain opportunities.
Kier Group managing director for Utilities and Rail, Barry McNicholas, said: “This new award is a great opportunity to play a key role within Openreach’s current and future ambitions.
“We have a long history of success in the telecoms sector and are responsible for the installation of over one million meters of fibre optic network cabling each year.”
Alongside the ONSA works, Kier also has the opportunity to bid for future works on the Openreach Fibre to the Premises framework.