The 1975 New National League was contested in 1975 as the second division of Speedway in the United Kingdom when British League Division Two was renamed. It was subsequently named the National League. Barrow Bombers, Long Eaton Archers and Sunderland Gladiators all dropped out from the previous season, Newcastle Diamonds, Crayford Kestrels, Paisley Lions and Mildenhall Fen Tigers joined the league, increasing it to 20 teams.