In its 24th year, the event takes place on February 16.
Alongside in-store initiatives to support runners, Runners Need will also provide kit advice, support training runs from its Brighton and London stores and provide prize vouchers for the overall and age category winners of the race.
“We’re delighted to come on board and support one of the UK’s leading half marathons,” Runners Need marketing manager Kirsty Jopson says.
“With 19 stores in London and the south east, we look forward to working with Brighton Half Marathon to support race participants’ training and race day needs.”