The Football Conference season of 1989–90 (known as the GM Vauxhall Conference for sponsorship reasons) was the eleventh season of the Football Conference.
Darlington, relegated to the Conference from the Fourth Division a year earlier, finished the season as Conference champions and regained their Football League status at the first attempt – just as Lincoln City had done two years earlier.
Coming down to the Conference from the Football League were the bottom placed Fourth Division club Colchester United.