thumb|right|Jean-François Séguier
Jean-François Séguier (; 25 November 1703 – 1 September 1784) was a French archaeologist, epigraphist, astronomer and botanist from Nîmes.
He studied law in Montpellier, during which time, he developed a passion for botany. He was a friend and collaborator to Scipio Maffei, with whom he took an extended scientific tour throughout Europe (1732–36). In 1755 he became a member of the Académie de Nîmes, serving as its secrétaire perpétuel from 1765 to 1784. In 1772 he became a member of the Académie royale des Inscriptions et Belles-Lettres.
The plant genus Seguieria (family Petiveriaceae, Loefl., 1758) commemorates his name, as do the botanical species Ranunculus seguieri (<small>Vill., 1779</small>), Euphorbia seguieriana (<small>Neck., 1770</small>), and Dianthus seguieri (<small>Vill., 1779</small>).
Published works
thumb|Plantae veronenses, 1745
His written works include a detailed description of the flora in the vicinity of Verona, titled ' (3 volumes 1745–54). Other noted works associated with Séguier are:
- Bibliotheca botanica, sive, Catalogus auctorum et librorum omnium qui de re botanica, de medicamentis ex vegetabilibus paratis, de re rustica, & de horticultura tractant, 1740. Séguier's Bibliotheca botanica includes Ovidio Montalbani's Bibliotheca botanica as an appendix.
- Dissertation sur l'ancienne inscription de la Maison-carrée de Nismes, 1759 – Dissertation on the ancient inscriptions of the Maison Carrée in Nîmes.
- Jean-François Séguier, Pierre Baux, lettres : 1733-1756.