Ten species of Gracillariidae (Lepidoptera, Gracillarioidea) have been found so far on the Galapagos Islands. In addition to Phyllocnistis citrella Stainton, reported elsewhere, nine new species or subspecies are described and illustrated: Acrocercops serrigera galapagosensis ssp. n. (reared from Waltheria ovata Cav., Sterculiaceae), Caloptilia don-davisi sp. n. (reared from Rhynchosia minima (L.) DC., Leguminosae), Caloptilia galacotra sp. n., Caloptilia cruzorum sp. n. (reared from Galactia sp., Leguminosae), Cryptolectica lazaroi sp. n. (reared from Synedrella nodiflora (L.) Gartn. and Ageratum conyzoides L., Asteraceae), Dialectica galapagosensis sp. n. (reared from Macraea laricifolia Hook. f., Asteraceae), Dialectica sanctaecrucis darwini ssp. n., Neurostrota magnifica sp. n., and Neurostrota brunnea sp. n. A lectotype is designated for Acrocercops serrigera Meyrick.