This catalogue includes a total of 31 species of Yponomeutoidea for which all or a part of type series have been deposited in the collection of the Museum of Comparative Zoology, Harvard University: 10 Argyresthiidae, eight Lyonetiidae, seven Ypsolophidae, two Yponomeutidae, two Plutellidae, one Heliodinidae, and one whose systematic position remains uncertain. Of these, the primary type specimens of Yponomeutoidea comprise six holotypes, 11 lectotypes, and one species described from syntypes. All primary and secondary type specimens of Yponomeutoidea from the collection are catalogued with annotations of their original citations, collecting data, specimen condition, current taxonomic status, and if necessary, notes on uncertainty involving the type series. Lectotypes are designated for 12 species from the collection of the Museum of Comparative Zoology, including eight argyresthiids (Argyresthia altissimella Chambers, 1877; Argyresthia austerella Zeller, 1873; Argyresthia belangerella Chambers, 1875; Argyresthia montella Chambers, 1877; Argyresthia pedmontella Chambers, 1877; Argyresthia quercicolella Chambers, 1877; Bucculatrix thuiella Packard, 1871; Argyresthia undulatella Chambers, 1874) and four confirmed or putative lyonetiids (Cemiostoma albella Chambers, 1871; Eurynome albella Chambers, 1877; Lyonetia alniella Chambers, 1875; Acanthocnemes fuscoscapulella Chambers, 1878), and for eight species from the collection of the Natural History Museum, London, including one argyresthiid (Argyresthia deletella Zeller, 1873), six ypsolophids (Cerostoma canariella Walsingham, 1881; Euceratia castella Walsingham, 1881; Cerostoma dentiferella Walsingham, 1881; Cerostoma falciferella Walsingham, 1881; Cerostoma frustella Walsingham, 1881; Euceratia securella Walsingham, 1881), and one plutellid (Plutella vanella Walsingham, 1881). The taxonomic identity of Pluteloptera ochrella Chambers, 1880, once a junior synonym of Ypsolopha ustella (Clerck, 1759), is revised with examination of the genitalia, which suggests that the species needs to be resurrected as a senior synonym of Cerostoma rubrella Dyar, 1902.