James Abram Garfield Rehn (October 26, 1881 – January 25, 1965) was an American entomologist who was a specialist on the New World Orthoptera.
He worked at the Academy of Natural Sciences of Philadelphia, making several collection expeditions around the world on their behalf.
Here he met many other naturalists including the ornithologist Witmer Stone from whom Rehn received informal training.
Hebard graduated from Yale and after working in the family business, he quit in 1911 and dedicated his life to entomology.
His son John William Holman Rehn was briefly interested in entomology and published some papers with his father but gave it up for a career in the US Army.