The 1989–90 season was FC Dinamo București's 41st season in Divizia A. In this season, Dinamo made the double, stopping Steaua's supremacy in Romania. In Europe, Dinamo reached the semifinals of the Cup Winners' Cup, where it is defeated by Anderlecht. It was a special season because of the Romanian Revolution of 1989. Dinamo dominated the first half of the season, winning the derby with Steaua, 3–0, on its ground. It was the first defeat for Steaua in the Romanian championship after 104 consecutive games. In the winter break, after the Revolution, Dinamo suffered administrative changes, for a few days having a different name – Unirea Tricolor.