Reddingius is a Dutch surname. Notable people with the surname include:
- Aaltje Noordewier-Reddingius (1868–1949), Dutch classical soprano
- Joannes Reddingius [nl] (1873–1944), Dutch poet
- Kiara Reddingius (born 1992), Australian bobsledder
- Regnerus Petrus Reddingius [nl] (1895–1957), Dutch physician and mayor
- Rutger Adolf Benthem Reddingius [nl] (1801–1863), Dutch mayor
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