This list of the mayflies recorded in the British Isles follows Macadam,[1] with nomenclature and taxonomy according to Kluge.[2] There are 51 species of mayfly known to occur in the British Isles, distributed among ten families.
- Ameletidae
- Ameletus inopinatus Eaton, 1887
- Arthropleidae
- Arthroplea congener Bengtsson, 1908
- Baetidae
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- Alainites muticus (Linnaeus, 1758)
- Baetis buceratus Eaton, 1870
- Baetis fuscatus (Linnaeus, 1761)
- Baetis rhodani (Pictet, 1843)
- Baetis scambus Eaton, 1870
- Baetis vernus Curtis, 1834
- Centroptilum luteolum (Muller, 1776)
- Cloeon dipterum (Linnaeus, 1761)
- Cloeon simile Eaton, 1870
- Labiobaetis atrebatinus (Eaton, 1870)
- Nigrobaetis digitatus (Bengtsson, 1919)
- Nigrobaetis niger (Linnaeus, 1761)
- Procloeon bifidum (Bengtsson, 1912)
- Procloeon pennulatum (Eaton, 1870)
- Caenidae
- Brachycercus harrisellus Curtis, 1834
- Caenis beskidensis Sowa, 1973
- Caenis horaria (Linnaeus, 1758)
- Caenis luctuosa (Burmeister, 1839)
- Caenis macrura Stephens, 1835
- Caenis pseudorivulorum Keffermüller, 1960
- Caenis pusilla Navás, 1913
- Caenis rivulorum Eaton, 1884
- Caenis robusta Eaton, 1884
- Ephemeridae
- Ephemera danica Müller, 1764
- Ephemera lineata Eaton, 1870
- Ephemera vulgata Linnaeus, 1758
- Ephemerellidae
- Ephemerella ignita (Poda, 1761)
- Ephemerella notata Eaton, 1887
- Heptageniidae
- Ecdyonurus dispar (Curtis, 1834)
- Ecdyonurus insignis (Eaton, 1870)
- Ecdyonurus torrentis Kimmins, 1942
- Ecdyonurus venosus (Fabricius, 1775)
- Electrogena affinis (Eaton, 1870)
- Electrogena lateralis (Curtis, 1834)
- Heptagenia longicauda (Stephens, 1835)
- Heptagenia sulphurea (Müller, 1764)
- Kageronia fuscogrisea (Retzius, 1783)
- Rhithrogena germanica Eaton, 1870
- Rhithrogena semicolorata (Curtis, 1834)
- Leptophlebiidae
- Habrophlebia fusca (Curtis, 1834)
- Leptophlebia marginata (Linnaeus, 1767)
- Leptophlebia vespertina (Linnaeus, 1758)
- Paraleptophlebia cincta (Retzius, 1783)
- Paraleptophlebia submarginata (Stephens, 1835)
- Paraleptophlebia werneri Ulmer, 1920
- Potamanthidae
- Potamanthus luteus (Linnaeus, 1767)
- Siphlonuridae
- Siphlonurus alternatus (Say, 1824)
- Siphlonurus armatus Eaton, 1870
- Siphlonurus lacustris Eaton, 1870