Karl Theodor Robert Luther (April 16, 1822–February 15, 1900) was a German astronomer who searched for asteroids while working in Düsseldorf.
| 17 Thetis | April 17, 1852 |
| 26 Proserpina | May 5, 1853 |
| 28 Bellona | March 1, 1854 |
| 35 Leukothea | April 19, 1855 |
| 37 Fides | October 5, 1855 |
| 47 Aglaja | September 15, 1857 |
| 53 Kalypso | April 4, 1858 |
| 57 Mnemosyne | September 22, 1859 |
| 58 Concordia | March 24, 1860 |
| 68 Leto | April 29, 1861 |
| 71 Niobe | August 13, 1861 |
| 78 Diana | March 15, 1863 |
| 82 Alkmene | November 27, 1864 |
| 84 Klio | August 25, 1865 |
| 90 Antiope | October 1, 1866 |
| 95 Arethusa | November 23, 1867 |
| 108 Hecuba | April 2, 1869 |
| 113 Amalthea | March 12, 1871 |
| 118 Peitho | March 15, 1872 |
| 134 Sophrosyne | September 27, 1873 |
| 241 Germania | September 12, 1884 |
| 247 Eukrate | March 14, 1885 |
| 258 Tyche | May 4, 1886 |
| 288 Glauke | February 20, 1890 |
Two of his discoveries are now known to have unusual properties: the binary asteroid with equal components 90 Antiope and the extremely slow-rotating 288 Glauke. The asteroid 1303 Luthera and the crater Luther on the Moon were named in his honour.
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