Pierre Paul Ferdinand Mourier de Neergaard (February 19, 1907 – November 13, 1987) was a Danish agronomist, mycologist and agriculturist.

[1] [2] Neergaard was training in seed pathology at the Royal Veterinary and Agricultural University in Copenhagen, Denmark (B.Sc., 1932; Ph.D., 1935; Sc.D, 1945).

He served as director of the Danish Government Institute of Seed Pathology for Developing Countries in Copenhagen.

From 1956 to 1974 he served as the chairman of the Plant Disease Committee of the International Seed Testing Association (ISTA).

Along with Mary Noble and Jo deTempe, he produced Annotated List of Seed-borne Diseases (4th edition, ISTA, 1990).