Meredith May Blackwell (born 1940) is an American mycologist, known as one of the world's leading experts on fungi associated with arthropods.

She graduated in 1973 with Ph.D. in botany from the University of Texas at Austin with thesis "A Developmental and Taxonomic Study of Protophysarum phloiogenum" under the supervision of C. J.

[3] At the University of Florida, Blackwell was an electron microscopist from 1972 to 1974 and an assistant in botany from 1974 to 1975.

She served as an editor for Molecular Phylogenetics and Evolution (1992–1999), Mycologia (1995–1997), Journal of African Mycology and Biotechnology (1998–2006), and Systematics and Geography of Plants (1999–2006).

[3] Blackwell is the co-editor of four books and the author or co-author of numerous scientific articles on such topics as termite-associated fungi, earwig-associated fungi, fungal infections of trees, molecular phylogeny of fungi, beetle-associated yeasts, and fungal evolution and taxonomy.