| Billy O'Neill | |
| Fullname: | William O'Neill |
| Birth Date: | 21 January 1916 |
| Birth Place: | Dundalk, Ireland |
| Death Place: | Dundalk, Ireland |
| Position: | Defender |
| Years1: | 1934-1944 |
| Clubs1: | Dundalk[1] |
| Caps1: | 330 |
| Goals1: | 30 |
| Nationalyears1: | 1935–1939 |
| Nationalteam1: | Irish Free State |
| Nationalcaps1: | 11 [2] |
| Nationalgoals1: | 0 |
William O'Neill (often also referred to as "Billy") was a footballer for Dundalk F.C. and an Irish international, who played as a defender.
O'Neill was capped eleven times for the Irish Free State at senior level. His debut was in a 5–3 home defeat to Netherlands on 8 December 1935.[2] with his final cap coming in a 1–1 draw away to Germany on 23 May 1939.[3]