The taxon authority Dahlgren may refer to:
- Bror Eric Dahlgren (1877–1961; Dahlgren), Swedish-American botanist
- Gertrud Dahlgren (1931–2009; G.Dahlgren), Swedish botanist
- Rolf Martin Theodor Dahlgren (1932–1987; R.Dahlgren), Swedish-Danish botanist
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