| Office: | Minister of Defence |
| Term Start: | 11 March 1905 |
| Term End: | 25 May 1907 |
| Primeminister: | Christian Michelsen |
| Predecessor: | Oscar Strugstad |
| Successor: | Christian Michelsen |
| Term Start2: | 27 April 1895 |
| Term End2: | 17 February 1898 |
| Primeminister2: | Emil Stang Francis Hagerup |
| Predecessor2: | Johannes Harbitz |
| Successor2: | Peter T. Holst |
| Term Start3: | 2 May 1893 |
| Term End3: | 15 July 1894 |
| Primeminister3: | Emil Stang |
| Predecessor3: | Peter T. Holst |
| Successor3: | Johannes Harbitz |
| Birth Name: | Christian Wilhelm Engel Bredal Olssøn |
| Birth Date: | 4 April 1844 |
| Birth Place: | Horten, Vestfold, United Kingdoms of Sweden and Norway |
| Death Place: | Ringsaker, Hedmark, Norway |
| Party: | Conservative |
| Spouse: | Marianne Hoel |
Christian Wilhelm Engel Bredal Olssøn (5 April 1844 – 3 November 1915) was a Norwegian military officer and politician. [1]
Olssøn was born in Horten in Vestfold, Norway. He was the son of Edvard Olssøn (1820–1867) and Leonore Rebecca Bredal (1820–1910). He received a military education at the Norwegian Military Academy (1866) and Norwegian Military College (1870). He received additional education at the Royal Institute of Technology in Stockholm (1872–1874).[2]
He was appointed major general in 1896. In 1898, he was commander at Oscarsborg, 1899 inspector general for coastal artillery. In 1907, he became lieutenant-general. He retired from military service in 1912 as commanding general. He served as Minister of Defence 1893–1894, 1895–1898, 1905–1907, and member of the Council of State Division in Stockholm 1894–1895.[3]