Siedler is a surname of:
- Charles Siedler (1839–1921), German-American politician, 20th Mayor of Jersey City, New Jersey
- Gerold Siedler (born 1933), German physical oceanographer
- Norbert Siedler (born 1982), Austrian racing driver
- Sebastian Siedler (born 1978), former racing cyclist from Germany
- Wolf Jobst Siedler (1926–2013), German publisher and writer
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