| Competition: | Welsh Alliance League |
| Season: | 2016–17 |
| Winners: | Division 1 – Glantraeth Division 2 – Llandudno Albion |
| Relegated: | Division 1 – Glan Conwy |
| Biggest Home Win: | Division 1 Division 2 |
| Biggest Away Win: | Division 1 Division 2 |
| Matches: | 422 |
| Total Goals: | 1731 |
| Highest Attendance: | 250 – Division 1 250 – Division 2 |
| Prevseason: | 2015–16 |
| Nextseason: | 2017–18 |
| Updated: | 26 February 2019 |
The 2016–17 Welsh Alliance League, known as the Lock Stock Welsh Alliance League for sponsorship reasons, is the 33rd season of the Welsh Alliance League, which consists of two divisions: the third and fourth levels of the Welsh football pyramid.
There are fourteen teams in Division 1 and sixteen teams in Division 2, with the champions of Division 1 promoted to the Cymru Alliance and the bottom team relegated to Division 2. In Division 2, the champions and runners-up are promoted to Division 1.
The season began on 12 August 2016 and concluded on 13 May 2017 with Glantraeth as Division 1 champions and Glan Conwy were relegated to Division 2. In Division 2, Llandudno Albion were champions with Mynydd Llandegai as runners-up. Both teams were promoted to Division 1.
Trearddur Bay were defending champions from the previous season. Greenfield and Nantlle Vale, who were Division 2 champions and runners-up, respectively from the previous season were promoted to Division 1.
| Team | Location | Ground | |
|---|---|---|---|
| Abergele Town | The Giant Hospitality Stadium | ||
| Wern Mynach | |||
| Cae Ffwt | |||
| Trefdraeth | |||
| Bagillt Road | |||
| Ffordd Padarn | |||
| Arriva Ground | |||
| Cae Nant | |||
| Bob Parry Field | |||
| Eithin Duon | |||
| Gwydir Park | |||
| Maes Dulyn | |||
| Maes Y Parc | |||
| Leisure Centre, Recreation Road | |||
| St Asaph City | Roe Plas | ||
| Trearddur Bay | Lon Isallt |
Greenfield were champions in the previous season and were promoted to Division 1 along with runners-up, Nantlle Vale. They were replaced by Llanfairpwll who were relegated from Division 1.
Gwynedd League champions, Y Felinheli and third place, Cemaes Bay were promoted to Division 2.
| Team | Location | Ground | |
|---|---|---|---|
| Lôn Bach | |||
| Cae Clyd | |||
| School Lane | |||
| Gaerwen | Lôn Groes | ||
| Llandudno Albion | Ffordd Dwyfor | ||
| Maes Eilian | |||
| Llannerch-y-medd | Tan Parc | ||
| Meliden | Ffordd Tŷ Newydd | ||
| Mochdre Sports | Swan Road | ||
| Mynydd Llandegai | Mynydd Llandegai | ||
| Penmaenmawr Phoenix | Cae Sling | ||
| Pentraeth | Bryniau Field | ||
| Prestatyn Sports | Gronant Playing Fields | ||
| Y Felinheli | Cae Selio, Bangor Street |