2016–17 Welsh Football League Division One
| Season | 2016–17 |
|---|---|
| Dates | 13 August 2016 – 6 May 2017 |
| Champions | Barry Town United |
| Promoted | Barry Town United |
| Relegated | Caldicot Town Risca United |
| Matches played | 240 |
| Goals scored | 833 (3.47 per match) |
← 2015–16 2017–18 → | |
The 2016–17 Welsh Football League Division One (known as the Nathaniel Cars Welsh Football League Division One for sponsorship reasons) was the 2016–17 season of the top football league in South Wales. Together with its North Wales counterpart, the Cymru Alliance, the 16-team division forms the second tier of the Welsh football league system, one level below the nationwide Welsh Premier League. The season began on 13 August 2016 and concluded on 6 May 2017.
On 18 April 2017, Barry Town United defeated Goytre United 3–0 to clinch promotion to the Welsh Premier League for the 2017–18 season.