Hearts have secured a new two-year sponsorship agreement with short-term loans company Wonga.com.
The Edinburgh outfit have not revealed how much the deal is worth but say it is the biggest shirt sponsorship deal in Scotland outside the Old Firm.
Hearts managing director David Southern said: "This reflects our aim to attract top-class corporate partners.
"We are looking forward to developing a partnership that will deliver significant benefits for both parties."
Ukio Bankas, the Lithuanian bank run by club owner Vladimir Romanov, has been the shirt sponsor for the past six years.
Wonga is already the main sponsor of Barclays Premier League club Blackpool and the broadcast partner of the FA Cup on ESPN.
The company said: "Hearts is a club with a great history and they are having a really strong season, so we were keen to support them when the opportunity came up.
"They show real class, on and off the pitch, and we can't wait to start being involved from next season onwards."