We show the existence of smooth isolated curves of different degrees and genera in Calabi-Yau threefolds that are complete intersections in homogeneous spaces. Along the way, we classify all degrees and genera of smooth curves on BN general K3 surfaces of genus mu, where 5 <= mu <= 10. By results of Mukai, these are the K3 surfaces that can be realised as complete intersections in certain homogeneous spaces.