Private Olaf (Olof) John Danielson was a Welsh soldier of the British Army who died during the First World War.
He was born in 1893, in Swansea, the son of Swedish-born general labourer Olaf and Eliza Ann Danielson, local to the area. At the time of the 1911 census, Danielson was working as a bottler while living with his family at 56 Rodney Street.
He has no known grave and is commemorated by the Thiepval Memorial.
- Danielson, Olaf, cwgc.org. Retrieved 13 October 2012.