| Krater | Diameter | Eponym | F/B | Tidsalder | Bemærkning |
|---|
| Baade | 55 km | Walter Baade (1893-1960) | F | - | |
| Babakin | 20 km | Georgij N. Babakin (1914-1971) | B | - | |
| Babbage | 143 km | Charles Babbage (1792-1871) | F | - | |
| Babcock | 99 km | Harold D. Babcock (1882-1968) | B | - | |
| Back | 35 km | Ernst Emil Alexander Back (1881-1959) | F | - | |
| Backlund | 75 km | Oskar Backlund (1846-1916) | B | - | |
| Baco | 69 km | Roger Bacon (ca. 1214-ca. 1294) | F | - | |
| Baillaud | 89 km | Benjamin Baillaud (1848-1934) | F | - | |
| Bailly | 287 km | Jean Sylvain Bailly (1736-1793) | F | - | |
| Baily | 26 km | Francis Baily (1774-1844) | F | - | |
| Balandin | 12 km | Aleksei A. Balandin (1898-1967) | B | - | |
| Balboa | 69 km | Vasco Núñez de Balboa (1475-1519) | F | - | |
| Baldet | 55 km | Fernand Baldet (1885-1964) | B | - | |
| Ball | 41 km | William Ball (ca. 1627-1690). | F | - | |
| Balmer | 138 km | Johann Balmer (1825-1898) | B | - | |
| Banachiewicz | 92 km | Tadeusz Banachiewicz (1882-1954) | F | - | |
| Bancroft | 13 km | Wilder Dwight Bancroft (1867-1953) | F | - | Tidligere "Archimedes A" |
| Banting | 5 km | Frederick Banting (1891-1941) | F | - | |
| Barbier | 66 km | Daniel Barbier (1907-1965) | B | - | |
| Barkla | 42 km | Charles Glover Barkla (1877-1944) | F | - | Tidligere "Langrenus A" |
| Barnard | 105 km | Edward Emerson Barnard (1857-1923) | F | - | |
| Barocius | 82 km | Francesco Barozzi (1537-1604) | F | - | |
| Barringer | 68 km | Daniel Barringer (1860-1929) | B | Nectarian | |
| Barrow | 92 km | Isaac Barrow (1630-1677) | F | - | |
| Bartels | 55 km | Julius Bartels (1899-1964) | F | - | |
| Bawa | 1 km | (Afrikansk drengenavn) | | | Se Bowditch |
| Bayer | 47 km | Johann Bayer (1572-1625) | F | - | |
| Beals | 48 km | Carlyle Smith Beals (1899-1979) | F | - | Tidligere "Riemann A" |
| Beaumont | 53 km | Jean-Baptiste Élie de Beaumont (1798-1874) | F | - | |
| Becquerel | 65 km | Henri Becquerel (1852-1908) | B | - | |
| Bečvář | 67 km | Antonin Becvar (1901-1965) | B | - | |
| Beer | 9 km | Wilhelm Beer (1797-1850) | F | - | |
| Behaim | 55 km | Martin Behaim (1459-1507) | F | - | |
| Beijerinck | 70 km | Martinus Willem Beijerinck (1851-1931) | B | - | |
| Beketov | 8 km | Nikolaj N. Beketov (1827-1911) | F | - | Tidligere "Jansen C" |
| Béla | 11 km | (Slavisk pigenavn) | | | Se Mons Hadley |
| Belʹkovich | 214 km | Igor V. Belkovitj (1904-1949) | F | - | |
| Bell | 86 km | Alexander Graham Bell (1847-1922) | B | - | |
| Bellinsgauzen | 63 km | Fabian Gottlieb von Bellingshausen (1778-1852) | B | - | |
| Bellot | 17 km | Joseph René Bellot (1826-1853) | F | - | |
| Belopolʹskiy | 59 km | Aristarkh Belopolsky (1854-1934) | B | - | |
| Belyaev | 54 km | Pavel Ivanovich Belyaev (1925-1970) | B | - | |
| Benedict | 14 km | Francis Gano Benedict (1870-1957) | B | - | |
| Bergman | 21 km | Torbern Olof Bergman (1735-1784) | B | - | |
| Bergstrand | 43 km | Carl Östen Emanuel Bergstrand (1873-1948) | B | - | |
| Berkner | 86 km | Lloyd V. Berkner (1905-1967) | B | - | |
| Berlage | 92 km | Hendrik Petrus Berlage (1896-1968) | B | - | |
| Bernoulli | 47 km | Jakob Bernoulli (1654-1705) | F | Øvre Imbrian | |
| Johann Bernoulli (1667-1748) |
| Berosus | 74 km | Berosus fra Kaldæa (?-ca. 250 f.Kr.) | F | - | |
| Berzelius | 50 km | Jöns Jakob Berzelius (1779-1848) | F | - | |
| Bessarion | 10 km | Basilios Bessarion (circa 1403-1472) | F | - | |
| Bessel | 15 km | Friedrich Wilhelm Bessel (1784-1846) | F | - | |
| Bettinus | 71 km | Mario Bettinus (1582-1657) | F | Nectarian | |
| Bhabha | 64 km | Homi J. Bhabha (1909-1966) | B | - | |
| Bianchini | 38 km | Francesco Bianchini (1662-1729) | F | - | |
| Biela | 76 km | Wilhelm von Biela (1782-1856) | F | - | |
| Bilharz | 43 km | Theodore Maximilian Bilharz (1825-1862) | F | - | |
| Billy | 45 km | Jacques de Billy (1602-1679) | F | - | |
| Bingham | 33 km | Hiram Bingham (1875-1956) | B | - | |
| Biot | 12 km | Jean-Baptiste Biot (1774-1862) | F | Eratosthenian | |
| Birkeland | 82 km | Olaf Kristian Birkeland (1867-1917) | B | Eratosthenian | |
| Birkhoff | 345 km | George D. Birkhoff (1884-1944) | B | - | |
| Birmingham | 92 km | John Birmingham (1816-1884) | F | Præ-Nectarian | |
| Birt | 16 km | William Radcliffe Birt (1804-1881) | F | Copernician | |
| Bjerknes | 48 km | Vilhelm Frimann Koren Bjerknes (1862-1951) | B | - | |
| Black | 18 km | Joseph Black (1728-1799) | F | - | |
| Blackett | 141 km | Patrick Maynard Stuart Blackett (1897-1974) | B | - | |
| Blagg | 5 km | Mary Adela Blagg (1858-1944) | F | Imbrian | |
| Blancanus | 117 km | Giuseppe Biancani (1566-1624) | F | Nectarian | |
| Blanchard | 40 km | Jean-Pierre Blanchard (1753-1809) | B | - | |
| Blanchinus | 61 km | Giovanni Bianchini (1410-ca. 1469) | F | - | |
| Blazhko | 54 km | Sergej Blazhko (1870-1956) | B | - | |
| Bliss | 20 km | Nathaniel Bliss (1700-1764) | F | - | |
| Bobillier | 6 km | Étienne Bobillier (1798-1840) | F | Copernician | |
| Bobone | 31 km | Jorge Bobone (1901-1958) | B | - | |
| Bode | 18 km | Johann Elert Bode (1747-1826) | F | Eratosthenian | |
| Boethius | 10 km | Boethius (ca. 480-524/525) | F | - | |
| Boguslawsky | 97 km | Palm Heinrich Ludwig von Boguslawski (1789-1851) | F | Præ-Nectarian | |
| Bohnenberger | 33 km | Johann G.F. von Bohnenberger (1765-1831) | F | Nedre Imbrian | |
| Bohr | 71 km | Niels Bohr (1885-1962) | F | - | |
| Bok | 45 km | Priscilla Fairfield Bok (1896-1975) | B | - | |
| Bart J. Bok (1906-1983) |
| Boltzmann | 76 km | Ludwig E. Boltzmann (1844-1906) | B | - | |
| Bolyai | 135 km | Janos Bolyai (1802-1860) | B | - | |
| Bombelli | 10 km | Raphael Bombelli (1526-1572) | F | Nedre Imbrian | |
| Bondarenko | 30 km | Valentin V. Bondarenko (1937-1961) | B | - | |
| Bonpland | 60 km | Aimé Bonpland (1773-1858) | F | Præ-Nectarian | |
| Boole | 63 km | George Boole (1815-1864) | F | - | |
| Borda | 44 km | Jean-Charles de Borda (1733-1799) | F | Nedre Imbrian | |
| Borel | 4 km | F.É.É. Borel (1871-1956) | F | Eratosthenian | |
| Boris | 10 km | (Russisk drengenavn) | F | - | |
| Borman | 50 km | Frank Borman (1928-) | B | Nedre Imbrian | |
| Born | 14 km | Max Born (1882-1970) | F | - | |
| Boscovich | 46 km | Ruggiero Giuseppe Boscovich (1711-1787) | F | - | |
| Bose | 91 km | Jagadis Chandra Bose (1858-1937) | B | - | |
| Boss | 47 km | Lewis Boss (1846-1912) | F | - | |
| Bouguer | 22 km | Pierre Bouguer (1698-1758) | F | Copernician | |
| Boussingault | 142 km | Jean Baptiste Boussingault (1802-1887) | F | Præ-Nectarian | |
| Bowditch | 40 km | Nathaniel Bowditch (1773-1848) | B | - | |
| Bowen | 8 km | Ira Sprague Bowen (1898-1973) | F | Imbrian | |
| Boyle | 57 km | Robert Boyle (1627-1691) | B | - | |
| Brackett | 8 km | Frederick Sumner Brackett (1896-1988) | F | Imbrian | |
| Bragg | 84 km | William Henry Bragg (1862-1942) | B | - | |
| Brashear | 55 km | John A. Brashear (1840-1920) | B | - | |
| Brayley | 14 km | Edward William Brayley (1801-1870) | F | Eratosthenian | |
| Bredikhin | 59 km | Fedor A. Bredikhin (1831-1904) | B | - | |
| Breislak | 49 km | Scipione Breislak (1748-1826) | F | Nedre Imbrian | |
| Brenner | 97 km | Leo Brenner (1855-1928) | F | Præ-Nectarian | |
| Brewster | 10 km | David Brewster (1781-1868) | F | Copernician | |
| Brianchon | 134 km | Charles Julien Brianchon (1783-1864) | F | Præ-Nectarian | |
| Bridgman | 80 km | Percy Williams Bridgman (1882-1961) | B | - | |
| Briggs | 37 km | Henry Briggs (1561-1630) | F | Øvre Imbrian | |
| Brisbane | 44 km | Thomas Brisbane (1770-1860) | F | - | |
| Bronk | 64 km | Detlev Wulf Bronk (1897-1975) | B | - | |
| Brouwer | 158 km | Dirk Brouwer (1902-1966) | B | - | |
| Luitzen Egbertus Jan Brouwer (1881-1968) |
| Brown | 34 km | Ernest William Brown (1866-1938) | F | Nedre Imbrian | |
| Bruce | 6 km | Catherine Wolfe Bruce (1816-1900) | F | - | |
| Brunner | 53 km | William Otto Brunner (1878-1958) | B | - | |
| Buch | 53 km | Christian Leopold von Buch (1774-1853) | F | Nedre Imbrian | |
| Buffon | 106 km | Georges-Louis Leclerc (1707-1788) | B | - | |
| Buisson | 56 km | Henri Buisson (1873-1944) | B | - | |
| Bullialdus | 60 km | Ismael Bullialdus (1605-1694) | F | Øvre Imbrian | |
| Bunsen | 52 km | Robert Bunsen (1811-1899) | F | - | |
| Burckhardt | 56 km | Johann Karl Burckhardt (1773-1825) | F | Nedre Imbrian | |
| Burnham | 24 km | Sherburne Wesley Burnham (1838-1921) | F | Nedre Imbrian | |
| Butlerov | 40 km | Aleksandr M. Butlerov (1828-1886) | B | - | |
| Buys-Ballot | 55 km | C.H.D. Buys Ballot (1817-1890) | B | - | |
| Byrd | 93 km | Richard E. Byrd (1888-1957) | F | - | |
| Bürg | 39 km | Johann Tobias Bürg (1766-1834) | F | Copernician | |
| Byrgius | 87 km | Joost Bürgi (1552-1632) | F | Nectarian | |
| Büsching | 52 km | Anton Friedrich Büsching (1724-1793) | F | Nedre Imbrian | |