Diadematidae is a family of sea urchins.
- Astropyga (Gray, 1825)
- Astropyga radiata (Leske, 1778), extant
- Astropyga pulvinata (Lamarck, 1816), extant
- Astropyga magnifica (Clark, 1934), extant
- Centrostephanus (Peters, 1855)
- Centrostephanus asteriscus (Agassiz & Clark, 1907), extant
- Centrostephanus coronatus (Verrill, 1867), extant
- Centrostephanus fragile (Wiltshire in Wright, 1882), Santonian, Maastrichtian, Danian
- Centrostephanus longispinus (Philippi, 1845), extant
- Centrostephanus nitidus (Koehler, 1927), extant
- Centrostephanus rodgersii (Agassiz, 1863), extant
- Chaetodiadema (Mortensen, 1903)
- Chaetodiadema granulatum (Mortensen, 1903), extant
- Chaetodiadema keiense (Mortensen, 1903), extant
- Chaetodiadema tuberculatum (Clark, 1909), extant
- Diadema (Humpfreys, 1797)
- Diadema palmeri (Baker, 1967), extant
- Diadema savignyi (Michelin, 1845), extant
- Diadema setosum (Leske, 1778), extant
- Diadema antillarum (Philippi, 1845), extant
- Diadema paucispinum (Agassiz, 1863), extant
- Diadema mexicanum (Agassiz, 1863), extant
- Diadema ascensionis (Mortensen, 1909), extant
- Echinodiadema (Verrill, 1867)
- Echinodiadema coronata (Verrill, 1867), extant
- Echinothrix (Peters, 1853)
- Echinothrix calamaris (Pallas, 1774), extant
- Echinothrix diadema (Linnaeus, 1758), extant
- Eodiadema, Lower Jurassic
- Eremopyga (Agassiz & Clark, 1908)
- Eremopyga denudata (De Meijere, 1904), extant
- Goniodiadema (Mortensen, 1939)
- Goniodiadema mauritiense (Mortensen, 1939), extant
- Kamptosoma (Mortensen, 1903), extant
- Palaeodiadema (Pomel, 1887), Santonian, Maastrichtian, Danian
- Pedinothuria (Louis, 1897)
- Pedinothuria cidaroides (Gregory, 1897), Callovian, Oxfordian
- Trichodiadema (Agassiz, 1863)
- Trichodiadema rodgersii (Agassiz, 1863), extant