2018–19 Northern Counties East Football League Division One

Division One consisted of 20 clubs.

The following 5 clubs left Division One before the season -
 * Brigg Town – relegated to Lincolnshire League
 * Eccleshill United – promoted to NCEL Premier Division
 * Knaresborough Town – promoted to NCEL Premier Division
 * Retford United – relegated to Central Midlands League
 * Yorkshire Amateur – promoted to NCEL Premier Division

The following 3 clubs joined Division One before the season -
 * Harworth Colliery - promoted from Central Midlands League North Division
 * Parkgate – relegated from NCEL Premier Division
 * Skegness Town - promoted from Lincolnshire League