| Regimental number | 2423 |
| Place of birth | Mylor, South Australia |
| Religion | Church of England |
| Occupation | Wood-cutter |
| Address | Aldgate, South Australia |
| Marital status | Single |
| Age at embarkation | 23 |
| Next of kin | Father, Charles Nielson, Aldgate, South Australia |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Keswick, South Australia |
| Rank on enlistment | Private |
| Unit name | 27th Battalion, 4th Reinforcement |
| AWM Embarkation Roll number | 23/44/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A15 Star Of England on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 10th Battalion |
| Fate | Killed in Action |
| Miscellaneous details (Nominal Roll) | Neilsen on NR |
| Age at death from cemetery records | 24 |
| Place of burial | Serre Road Cemetery No. 2 (Plot XXII, Row D, Grave No. 6), France |
| Panel number, Roll of Honour, Australian War Memorial | 60 |
| Miscellaneous information from cemetery records | Parents: Charles and Marian NIELSEN |