Vadim Nikolaevich Delaunay[1] (Russian: Вади́м Никола́евич Делоне́, IPA: [vɐˈdʲim nʲɪkɐˈlajɪvʲɪtɕ dʲɪlɐˈnʲɛ] ⓘ; December 22, 1947, Moscow – June 13, 1983, Paris) was a Soviet poet and dissident, who participated in the 1968 Red Square demonstration of protest against military suppression of the Prague Spring.

On September 1, 1967, together with Bukovsky and Kushev, he was sentenced to 1 year (conditionally) as a participant in a demonstration on Pushkin Square in defense of Galanskov, Dobrovolsky, and Lashkova.

Delaunay's sentence required him to move away from Moscow, so he went to Novosibirsk State University to a friend and pupil of his grandfather, Aleksandr Aleksandrov.

At the beginning of 1968, after the court hearing for Galanskov and Ginzburg, Delaunay wrote an open letter to Literaturnaya Gazeta in which he praised their bravery.

On August 25, 1968, he and seven other dissidents organized the now-famous demonstration in support of the Prague Spring in Red Square near the Moscow Kremlin.

Delaunay and Pavel Litvinov held the famous banner with the words "ЗА ВАШУ И НАШУ СВОБОДУ" ("For your freedom and ours").