The roots of the school go back to October 13, 1836, when
Theodor Fliedner and his wife founded an Educational Institute for Deaconesses in Kaiserswerth. In 1908, a higher girls' school was established, which later evolved into the current Gymnasium. The renovation included the construction of a cafeteria, swimming pool, and sports facilities, which were funded by the Evangelical Church in the Rhineland. By the mid-2020s, Theodor-Fliedner-Gymnasium was consistently mentioned in regional media as one of the Gymnasien in Düsseldorf with particularly high demand in the school enrollment process. In the first admission phase for the 2025/26 school year, city statistics showed that the school was among the Gymnasien with the highest number of applications relative to available places, with 230 first-choice applications recorded in February 2025. == School Profile ==