Brown, who has spent his career to date working across the Asia Pacific region, has most recently held the position of CEO of retail & commercial markets Asia for RBS.
Prior to joining RBS, Brown held a number of senior management roles at ABN Amro. He also held various senior positions at Citibank in Taiwan, Australia and New Zealand.
Brian Hartzer, CEO of UK Retail, Wealth and Ulster, said Brown brings a wealth of experience to this position which underlines our ongoing commitment to Ulster Bank and to the island of Ireland.
"Ulster Bank will benefit hugely from his experience of successfully leading businesses across a range of diverse markets, delivering strong financial results through change and difficult market conditions," Hartzer said.