• Obelia Hartlaub, 1897 accepted as Hartlaubella Poche, 1914 [Family: Campanulariidae]
• Obelia Lamouroux, 1821 (uncertain) [Family: Bryozoa (awaiting allocation)]
• Obelia Péron & Lesueur, 1810 [Family: Campanulariidae]
• Obelia alternata Fraser, 1938 accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia angulosa Bale, 1888
• Obelia articulat (Aghassiz, 1865) accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia articulata (Agassiz, 1865)
• Obelia australis von Lendenfeld, 1885 accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia austrogeorgiae Jäderholm, 1905
• Obelia bicuspidata Clark, 1875 accepted as Obelia bidentata Clark, 1875
• Obelia bidentata Clark, 1875
• Obelia biscuspidata Clark, 1875
• Obelia biserialis Fraser, 1948 accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia castellata Clarke, 1894
• Obelia cheloniae (Allman, 1888) accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia cheloniae Jarvis, 1922 accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia commissuralis McCrady, 1859 accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia corona Torrey, 1904 accepted as Obelia bidentata Clark, 1875
• Obelia coughtreyi Bale, 1924
• Obelia delicatula Thornely, 1900 accepted as Clytia delicatula (Thornely, 1900)
• Obelia dichotoma (Linnaeus, 1758)
• Obelia diversa (Fraser, 1948)
• Obelia equilateralis Fraser, 1938
• Obelia fimbriata (Dalyell, 1848)
• Obelia flabellata (Hincks, 1866) accepted as Obelia longissima (Pallas, 1766)
• Obelia gelantinosa (Pallas, 1766) accepted as Hartlaubella gelatinosa (Pallas, 1766)
• Obelia geniculata (Linnaeus, 1758)
• Obelia hyalina Clarke, 1879
• Obelia irregularis Fraser, 1943
• Obelia longa Stechow, 1921 accepted as Obelia bidentata Clark, 1875
• Obelia longicyatha Allman, 1877
• Obelia longissima (Pallas, 1766)
• Obelia lucifera Forbes, 1848
• Obelia microtheca Fraser, 1938
• Obelia multidentata Fraser, 1914 accepted as Obelia bidentata Clark, 1875
• Obelia nodosa Bale, 1924 accepted as Obelia dichotoma (Linnaeus, 1758)
• Obelia obtusidens (Jäderholm, 1904)
• Obelia paulensis (Vanhöffen, 1910)
• Obelia plana Haeckel, 1879 accepted as Obelia longissima (Pallas, 1766)
• Obelia plicata Hincks, 1868
• Obelia racemosa Fraser, 1941
• Obelia spinulosa (Bale, 1888) accepted as Obelia bidentata Clark, 1875
• Obelia spongicola Watson, 2011
• Obelia striata Clarke, 1907
• Obelia surcularis Calkins, 1899
• Obelia tenuis Fraser, 1938