| Season: | 2019 |
| Dates: | February 2019 – October 2019 |
| Competition: | League of Ireland First Division |
| Winners: | Shelbourne (1st title) |
| Promoted: | Shelbourne |
| Matches: | 135 |
| Total Goals: | 501 |
| League Topscorer: | Rob Manley (17 goals) |
| Biggest Home Win: | Shelbourne 7-0 Limerick |
| Biggest Away Win: | Athlone Town 0-5 Bray Wanderers , Cabinteely 0-5 Drogheda United |
| Attendance: | 75,795 |
| Average Attendance: | 561[1] |
| Prevseason: | 2018 |
| Nextseason: | 2020 |
The 2019 League of Ireland First Division season was the 35th season of the League of Ireland First Division. The league began in February 2019 and concluded in October 2019. Shelbourne emerged as champions after beating title rivals Drogheda United 3–1 away from home on 13 September 2019, earning them promotion to the top flight for the first time since 2012.
The First Division has 10 teams. Each team plays each other three times for a total of 27 matches in the season.
| Team | Location | Stadium | Capacity | |
|---|---|---|---|---|
| 5,000 | ||||
| 4,000 | ||||
| 1,620 | ||||
| 3,000 | ||||
| 2,000 | ||||
| 5,000 | ||||
| 5,000 | ||||
| 4,960 | ||||
| 3,500 | ||||
| 2,500 |
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
| Team | Manager | Captain | Kit manufacturer | Shirt sponsor | |
|---|---|---|---|---|---|
| Athlone Town |  Terry Butler | Committee | Nike | Nitro Sports | |
| Bray Wanderers | Gary Cronin | Paul Keegan | Umbro | Matt Britton Carpets | |
| Cabinteely | Pat Devlin | Stephen McGuinness | Uhlsport | Dublin School of Grinds | |
| Cobh Ramblers | Paul Hunt | Joma | Tony & William O'Shea Fuels Rushbrooke | ||
| Drogheda United | Tim Clancy | Jake Hyland | CX+ Sport | Scotch Hall Shopping Center | |
| Galway United | Alan Murphy | Stephen Walsh | Puma | Comer Property Management | |
| Limerick | Tommy Barrett | Shaun Kelly | Umbro | Daly Car Sales | |
| Longford Town | Neale Fenn | Dean Zambra | Macron | City Calling | |
| Shelbourne | Ian Morris | Dean Delaney | Umbro | abbeyseals.ie | |
| Wexford | Brian O'Sullivan | Craig McCabe | Bodibro | Premier Tickets |
Teams play each other twice (once at home, once away).
Teams play each other once.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 | Rob Manley | Cabinteely | 17 |
| 2 | Chris Lyons | Drogheda United | 13 |
| 3 | Dean Byrne | Longford Town | 12 |
| Mark Doyle | Drogheda United | 12 | |
| 5 | Ciarán Kilduff | Shelbourne | 10 |
| Dylan McGlade | Bray Wanderers | 10 | |
| Stephen Meaney | Drogheda United | 10 | |
| 8 | Danny Furlong | Wexford | 9 |
| 9 | Jaze Kabia | Shelbourne | 8 |
| Sam Verdon | Longford Town | 8 |
Cabinteely advances on away goals.