Ulla Wiesner (born 12 December 1940) is a German singer who was active from 1963 to 2002.

In 1965, she represented Germany in the Eurovision Song Contest, with "Paradies, wo bist du?" (Paradise, where are you?). The song scored zero points along with three other countries out of the total of eighteen countries that entered the contest. Other than the Eurovision Song Contest, where her zero-point result hurt her solo career before it had even fully begun, she was mainly active with the Botho-Lucas-Chorus, where she stayed as chorister for 30 years, notable for their musical accompaniment on the German TV show Musik ist Trumpf.

Wiesner is also the vocalist on several songs in the Brilliant-Musik archives, founded by Werner Tautz, who wrote several songs for her together with Heinz Kiessling and Hans Gerig. Wiesner released an album called Twilight Mood in 1970 with Addy Flor and his Orchestra. As one of Germany's busiest studio singers, she was assigned as backing vocalist for many popular artists, including Triumvirat's album Illusions on a Double Dimple in 1974. Since then, notable singles of hers include "Abends kommen die Sterne" ("In the evening the stars appear"), "Wenn dieser Tag zu Ende geht" ("When this day comes to an end") and "Charade".