Calonectria

{{Short description|Genus of fungi}}

{{Automatic taxobox

| image = Calonectria kyotensis.jpg

| image_caption = Calonectria kyotensis sporing structures

| image_alt = Calonectria kyotensis sporing structures

| taxon = Calonectria

| authority = De Not. (1867)

| type_species = Calonectria daldiniana

| type_species_authority = De Not. (1867)

| subdivision_ranks = Species

| subdivision = See text

}}

Calonectria (anamorph Cylindrocladium{{Cite book|editor=Horst, R. Kenneth|year=2008 |title=Westcott's Plant Disease Handbook|edition=seventh|location=Dordrecht|publisher=Springer Verlag|page=[https://books.google.com/books?id=M6WLVNWDQ-QC&pg=PA463 463]|isbn=978-1-4020-5193-7}}) is a genus of ascomycete fungi. Calonectria species are plant pathogens.