2019–20 Northern Counties East Football League Division One

Division One consisted of 20 clubs.

The following 5 clubs left Division One before the season -
 * Grimsby Borough – promoted to NCEL Premier Division
 * FC Bolsover – transferred to East Midlands Counties League
 * Emley – transferred to North West Counties League Division One North
 * Harworth Colliery – relegated to Step 7
 * Shirebrook Town – transferred to East Midlands Counties League

The following 5 clubs joined Division One before the season -
 * Brigg Town - promoted from Lincolnshire League
 * Hall Road Rangers - relegated from Northern Counties East League Premier Division
 * Harrogate Railway Athletic relegated from Northern Counties East League Premier Division
 * North Ferriby - new club
 * Retford - promoted from Central Midlands League North Division

In addition, East Yorkshire Carnegie were renamed as East Hull