1. Babyloniidae Kuroda, Habe & Oyama 1971
2. Baetidae Ulmer 1920
3. Bagridae Bleeker 1858
4. Balaenidae Gray 1821
5. Balaenopteridae Gray 1864
6. Balanidae Leach 1817
7. Balistidae A. Risso 1810
8. Balitoridae Swainson 1839
9. Banjosidae Jordan & Thompson 1912
10. Basiliolidae Cooper 1959
11. Batillariidae Thiele 1929
12. Belonidae Bonaparte 1832
13. Belontiidae
14. Belostomatidae Leach 1815
15. Bembridae Kaup 1873
16. Benthesicymidae Wood-Mason & Alcock 1891
17. Berberidaceae de Jussieu 1789
18. Beroidae Eschscholtz 1825
19. Berycidae R.T. Lowe 1843
20. Bethylidae Halliday 1839
21. Betulaceae Gray 1822
22. Bivesiculidae Yamaguti 1934
23. Blaberidae Saussure 1864
24. Blattidae
25. Blenniidae Rafinesque 1810
26. Bodotriidae T. Scott 1901
27. Bolinopsidae Bigelow 1912
28. Bombycillidae Swainson 1831
29. Bombyliidae Latreille 1802
30. Boraginaceae de Jussieu 1789
31. Bothidae Regan 1910
32. Bothriocephalidae Blanchard 1849
33. Bouchardiidae Allan 1940
34. Bougainvilliidae Lütken 1850
35. Bovidae Gray 1821
36. Brachinidae Bonelli 1810
37. Brachionidae Ehrenberg 1838
38. Brachylaimidae Joyeux & Foley 1930
39. Braconidae Nees 1812
40. Bradybaenidae Pilsbry 1934 (1898)
41. Bradyrhizobiaceae Garrity et al. 2006
42. Brassicaceae Burnett 1835
43. Brissidae Gray 1855
44. Buccinidae Rafinesque 1815
45. Bucephalidae Poche 1907
46. Bucerotidae Rafinesque 1815
47. Bufonidae Gray 1825
48. Bursidae Thiele 1925
49. Bythitidae T.N. Gill 1861