Jean Nicolas Collignon (1762–?1788) was a gardener and botanist from the Jardin du Roi who served on the La Pérouse expedition to the South Seas (1785–?1788).
Following the three voyages of James Cook, French King Louis XVI had commanded a similar expedition be sent out by France. The La Pérouse expedition consisted of the frigates La Boussole, the flagship with Collignon in the crew, and L’Astrolabe under the command of Fleuriot de Langle. The two ships left Brest on the 1 August 1785 and were last seen at Botany Bay, New Holland on 26 January 1788.
Collignon was born in Metz, France in 1762. He was recommended for the voyage by André Thouin, Director of Horticulture at the Jardin du Roi. Collignon was just 24 and had previously only worked under the direction of Thouin, who judged him as "active and intelligent". Thouin in his recommendation emphasised that Collignon should not be subordinate to the expedition's botanist, Joseph Hugues Boissieu La Martinière, and so the two were assigned to different ships. Collignon was permitted to assist the other naturalists provided this did not interfere with his principal mission.
The ships anchored at the fertile Catherine Island off the southern coast of Brazil on 6 November 1785, and after a welcome reception, Collignon took on board orange and lemon trees to join the other live plants he had gathered for the South Seas: he also took on cotton, rice, maize and other staples of the tropics.
The expedition anchored on Easter Island on 9 April 1786 and was able to land goats, ewes and pigs that had been purchased at the port of Concepcion, Chile. After viewing native plantations of yams and sweet potatoes Collignon judged the soil suitable for planting seed and he explained to the natives that the seed would produce plants that were good to eat. They appeared to understand, indicating where they thought the plants would grow best. He planted cabbage, carrots, beets, maize and pumpkins.