Sheffield Wednesday and Sheffield United have announced their joint club sponsors are to extend their current deal by two years.
Westfield Health, one of the UK's leading not-for-profit health insurance providers, will continue to appear on the front of both the Blades' home shirt and the Owls' away shirt next season.
Sheffield Wednesday chairman Milan Mandaric said: "Sheffield Wednesday and Westfield Health were proud partners in League One and both parties are now looking forward to more of the same next season.
"We have achieved our aim of promotion and I'm delighted that the Owls will help enhance the brand and support of Westfield Health as key club sponsors in the Championship."
Sheffield United chairman Kevin McCabe said: "We've just celebrated the fact that Westfield has been sponsoring the Blades in different ways for more than 50 years, so we're delighted to move into a new era with the support, once again, of one of the biggest names in health insurance.
"We are proud to carry the Westfield name on our shirts and we hope we can get the new era of sponsorship off to a winning start at Wembley."
Westfield chief executive Jill Davies added: "Our success owes a huge amount to our Sheffield roots. A large number of our policyholders are from Sheffield and the surrounding region, so working with the clubs provides a fantastic opportunity to showcase to a significant proportion of our policyholders that we understand what's important to them, while also giving us the opportunity to inform about Westfield."