| Frank Nielsen | |
| Fullname: | Francis Ormond Nielsen |
| Birth Date: | 1 March 1891 |
| Birth Place: | Preston, Victoria |
| Death Place: | Heidelberg, Victoria |
| Height: | 178 cm |
| Weight: | 73 kg |
| Statsend: | 1925 |
| Years1: | 1925 |
| Games Goals1: | 4 (0) |
Francis Ormond Nielsen (1 March 1891 – 3 December 1970) was an Australian rules footballer who played with Footscray in the Victorian Football League (VFL).[1]