The National League speedway 2019 now known as the National Development League for the 2019 season was the third tier/division of British speedway. There were several team changes for the 2019 league season with reigning league champions and KO cup winners Eastbourne Eagles, along with the Birmingham Brummies, moving into the SGB Championship. Coventry Bees, who rode their home meetings at Leicester the previous season, did not enter the league, but Leicester Lions entered a team (Leicester Lion Cubs). Cradley Heathens fully entered the league after the previous season National Trophy only commitment, while the Buxton Hitmen decided not compete and only run open meetings (friendlies). It was announced on Tuesday 10 September before the end of the 2019 National Development League season that Stoke Potters' home venue at Loomer Road Stadium had been sold and that the team would not be operating in 2020.
At the Speedway AGM in November 2018, the team averages were reduced to 36.00 points per team.
Teams face each other two times: once home and once away.
Home team scores are in bold<br> Overall aggregate scores are in <span style="color:red">red</span>
Semi-finals
Grand Final
The 2019 National Development League Knockout Cup was the 22nd edition of the Knockout Cup for tier three teams.
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Home team scores are in bold<br> Overall aggregate scores are in <span style="color:red">red</span>
Quarter-finals
Semi-finals
Grand Final
Teams face each other two times: once home and once away.
Raced at the Eddie Wright Raceway, Scunthorpe on 20 October. The meeting was decided on count back for riders first three rides, after rain prevented the meetings full conclusion. Scores below are from the referee's official National League Riders Individual Championship score sheet.<br>
The National League Pairs Championship, was held at Owlerton Stadium, on 25 August 2019. The event was won by Drew Kemp and Anders Rowe of the Kent Kings.
Stoke won the NDL Fours, held on 13 July 2019 at Loomer Road Stadium.
Belle Vue Colts
7 June Connor Bailey replaced the injured Paul Bowen in the Belle Vue Colts team
Cradley Heathens
21 May Jack Smith replaced the injured Tom Brennan in the Cradley Heathens team<br> 6 June Sheldon Davies replaced Lewis Whitmore in the Cradley Heathens team
Isle of Wight Warriors
1 July Scott Campos replaced Ryan Terry-Daley in the Isle of Wight team
Kent Kings
2 June Jacob Clouting replaced the injured Dan Gilkes in the Kent Kings team<br> 15 August Jake Mulford replaced the injured Nathan Ablitt in the Kent Kings team<br> 6 September Alex Spooner replaced Jacob Clouting in the Kent Kings team
Leicester Lion Cubs
11 April Ryan MacDonald replaced Kelsey Dugard in the Leicester Lion Cubs team<br> 9 July Ryan Terry-Daley replaced the injured Jamie Halder in the Leicester Lion Cubs team<br> 29 August Josh Embleton replaced Ryan MacDonald in the Leicester Lion Cubs team
Mildenhall Fen Tigers
16 June Henry Atkins and Arran Butcher replaced the injured Macauley Leek and David Wallinger in the Mildenhall team<br> 13 August Ryan Kinsley replaced the injured Danny Ayres in the Mildenhall Fen Tigers team
Plymouth Gladiators
26 June David Wallinger replaced Scott Campos in the Plymouth team<br> 10 July Luke Chessell replaced the injured Nathan Stoneman in the Plymouth team<br> 28 August Tom Young and Kris Andrews replaced the injured Adam Extance and David Wallinger in the Plymouth team<br> 6 September Nathan Stoneman replaced Luke Chessell in the Plymouth team
Stoke Potters
9 January Shelby Rutherford replaced Paul Burnett in the Stoke Potters team<br> 9 May Lawlor replaced Luke Chessell in the Stoke Potters team<br> 23 July Corban Pavitt quit the Stoke Potters team for personal reasons<br> 31 August Kieran Douglas replaced Corban Pavitt in the Stoke Potters team