Jacques-Louis Soret (30 June 1827 – 13 May 1890) was a Swiss chemist who in 1878, along with Marc Delafontaine, first observed holmium spectroscopically. Independently, Per Teodor Cleve separated it chemically from thulium and erbium in 1879. The three are given credit for the element's discovery.
Soret was also responsible for correctly working out the chemical composition of ozone as being three oxygen atoms bound together.
The Soret peak, a strong absorption band of hemoglobin is also named after him.
His son was Charles Soret, a recognized physicist and chemist in his own right.