Arthur London will help the charity to review its supporter and membership proposition, as well as refresh its tone of voice, core messages and visual identity.
Code Computerlove’s remit includes creating tools to help people track and monitor their MS and new forums for support.
John Palmer, the executive director of marketing and communications at the MS Society, said: "We are aiming to position the MS Society as front of mind and more relevant to all those affected by MS in the UK, increase people’s propensity to support us and grow awareness and understanding of MS.
"We know we need to embed a digital mindset in the charity and explore new ways of using digital technologies to improve the lives of people affected by MS.
"Our digital transformation programme will go beyond overhauling our website and digital platforms and will involve a complete rethink of the role of digital in achieving our organisational objectives."