Isabel Waidner (born 14 February 1974) is a German-British writer and cultural theorist based in London, England.

[3] After receiving their doctorate, titled "Experimental fiction, transliteracy, and 'Gaudy Bauble': towards a queer avant-garde poetics", they taught creative writing at the University of Roehampton.

[6][7] Along with artist Richard Porter, Waidner is the co-founder of the Queers Read This, an event series hosted by the Institute of Contemporary Arts (ICA).

They were the host and curator of the ICA's literary talk series, This Isn't a Dream, which was live-streamed fortnightly via Instagram Live between January and May 2021.

Waidner has written extensively about working-class queer and transgender people, nationalism, and how "the British novel tends to reproduce white, middle-class values and aesthetics", with their work standing in opposition to these motifs.