Pierre Alfred Déséglise

Pierre Alfred Déséglise (28 October 1823, Bourges – 13 December 1883, Geneva) was a French botanist.

He was a student of Alexandre Boreau (1803–1875), with whom he botanized and collected plants in the department of Cher and surrounding areas. In the midst of hardship in 1871, he relocated to Geneva, where in 1874 he began work as an assistant curator at the Conservatoire Botanique. At the time of his death, his collection of roses were sent to the herbarium at the Royal Botanical Gardens at Kew.

In his botanical studies, he focused on plants from the genera Rosa, Mentha and Thymus.

He issued the exsiccata-like series Herbarium Rosarum.