Thistledown may refer to:
The soft feathery material which protects the fruiting part of a thistle Thistledown (film), a 1938 British musical film Thistledown (racecourse), a thoroughbred racing track in North Randall, Ohio, near Cleveland Thistledown, Colorado Thistledown family, characters in The Dark Elf Trilogy by R. A. Salvatore Operation Thistledown, a World War II operation in Italy A fictional starship in The Way, a trilogy of novels by Greg Bear
See also Thistledome