Hanover won the brief, which covers healthcare comms and public affairs in the UK, following a three-way competitive pitch.
The agency said it "will be working with Steris to engage policymakers and NHS leaders in the UK". "In particular, Hanover will be highlighting the contribution of hospital specialty services to high quality, safe and cost-efficient healthcare. "
Steris, which is headquartered in the UK but listed on the New York Stock Exchange, sells a range of products associated with surgery across 60 countries.
Gerry Reis, senior vice-president of government affairs at Steris, said: "We chose Hanover because of its in-depth understanding of the UK healthcare environment and good chemistry between our respective teams. We’re looking forward to working with it to tell our story to key constituents."