We describe ten new species of Blechnum (Blechnaceae, Pteridophyta) from Bolivia and provide a key to the Bolivian species of the genus. The new species are: B. bicolor, B. bolivianum, B. bruneum, B. cochabambense, B. pazense, B. reflexum, B. repens, B. smilodon, B. squamatum, and B. vallegrandense. Blechnum gracilipes and B. squamipes are elevated to species rank.