Aalst is Dutch surname. Notable people with the surname include:
Diederik van Aalst, the last lord/count of the Land of Aalst J. A. van Aalst (1858–1914), Belgian customs and postal officer in China Roy van Aalst (born 1983), Dutch politician Wil van der Aalst (born 1966), Dutch computer scientist
See also Van Aelst, Dutch and Flemish surname