| Age | 60 (age at death) |
| Birthday | 21 January, 1848 |
| Birthplace | Diest, Belgium |
| Died | 21 June, 1908 |
| Place of Death | Paris, France |
| Zodiac Sign | Aquarius |
| Nationality | Belgian |
| Occupation | Scientist |
Luíz Cruls or Luís Cruls or Louis Ferdinand Cruls (21 January 1848 – 21 June 1908) was a Belgian-Brazilian astronomer and geodesist. He was Director of the Brazilian National Observatory from 1881 to 1908, led the commission charged with the survey and selection of a future site for the capital of Brazil in the Central Plateau, and was co-discoverer of the Great Comet of 1882. Cruls was also an active proponent of efforts to accurately measure solar parallax and towards that end led a Brazilian team in their observations of 1882 Transit of Venus in Punta Arenas, Chile.
