John Nesbitt joined in 2010 as the group's chief financial officer, a Suncorp statement said.
During his time with the bank, Mr Nesbitt has overseen the implementation of several strategic projects. He is set to depart in the second half of 2016 while an internal and external search for a replacement is underway.
"At an industry level, John took a leading role in the Suncorp Bank and Joint Regional Banks Submission to the Financial Sector Inquiry led by David Murray, successfully establishing the need for an even-playing field for all banks," Suncorp chief executive and managing director Michael Cameron said.
"I'm sure John will continue to make a valuable contribution as he embarks on the next chapter of his future, pursuing board directorships. On behalf of Suncorp, I'd like to thank John for his contribution and wish him all the best for the future."
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