Great Western Bank (South Dakota)
| Great Western Bank | |
| Company type | Public |
| NYSE: GWB (2004-2022) | |
| Industry | Financial services |
| Founded | 1935 |
| Defunct | February 1, 2022 |
| Fate | Acquired by First Interstate BancSystem |
| Successor | First Interstate Bank |
| Headquarters | Sioux Falls, South Dakota, United States |
Key people | Kevin P. Riley, President & CEO |
| Products | Financial services |
| Total assets | $32.00 billion |
Number of employees | Nearly 1,500 (2012) |
| Website | Last snapshot of website prior to merger |
Great Western Bank, whose holding company was Great Western Bancorp, Inc. (NYSE: GWB), was a regional bank based in Sioux Falls, South Dakota, United States. There were over 170 locations in Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota and South Dakota. In September of 2021 they announced a merger with First Interstate BancSystem and completed it in February of the following year. Great Western Bank had assets of $12.39 billion at the time of its merger.