The 1989–90 Full Members' Cup, known as the Zenith Data Systems Cup for sponsorship reasons, was the 5th staging of a knock-out competition for English football clubs in the First and Second Division. The winners were Chelsea and the runners-up were Middlesbrough.
The competition began on 7 November 1989 and ended with the final on 25 March 1990 at the Wembley Stadium.
In the first round, there were two sections: North and South. In the following rounds each section gradually eliminates teams in knock-out fashion until each has a winning finalist. At this point, the two winning finalists face each other in the combined final for the honour of the trophy.
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