Cudweed is a common name for several species, and may refer to:

Plants

in the family Asteraceae

• Gamochaeta, a plant genus with species in North and South America

• Gnaphalium, a plant genus with species in Eurasia and the Americas

• Filago, a plant genus in Eurasia and North America

• Pseudognaphalium, a plant genus native to North America (e.g. Pseudognaphalium luteoalbum)

• Euchiton, a plant genus native to Australasia and the Pacific

• Helichrysum, a plant genus occurring in Africa, Australasia and Eurasia.

Animals

• Cucullia gnaphalii, a moth in the family Noctuidae