This is a list of butterflies of Guam.
Hesperiidae
Coeliadinae Badamia exclamationis (Fabricius, 1775) Hasora chromus chromus (Cramer, 1780)
Hesperiinae Erionota thrax (Linnaeus, 1767) Taractrocera luzonensis (Staudinger, 1889)
Papilionidae
Papilioninae Papilio polytes palewensis Nakamura, 1933
Pieridae
Coliadinae Catopsilia pomona (Fabricius, 1775)
Lycaenidae
Polyommatinae Catochrysops panormus papuana Tite, 1959 Lampides boeticus (Linnaeus, 1767) Zizula hylax dampierensis (Rothschild, 1915)
Nymphalidae
Danainae Danaus plexippus plexippus (Linnaeus, 1758) Euploea eunice kadu (von Eschscholtz, 1821) Euploea algea eleutho (Quoy & Gaimard, 1824)
Satyrinae Melanitis leda ponapensis Mathew, 1889
Limenitidinae Neptis hylas guamensis (Swinhoe, 1916)
Nymphalinae Hypolimnas bolina nerina (Fabricius, 1775)
Heliconiinae Vagrans egestina (Quoy & Gaimard, 1824)
References W.John Tennent: A checklist of the butterflies of Melanesia, Micronesia, Polynesia and some adjacent areas. Zootaxa 1178: 1-209 (21 Apr. 2006)