"Tideline" is a science fiction short story by American writer Elizabeth Bear, published in 2007. It won the 2008 Hugo Award for Best Short Story and the 2008 Theodore Sturgeon Award (tied with "Finisterra" by David R. Moles). "Tideline" appears in the twenty-fifth volume of Gardner Dozois's Year's Best Science Fiction anthology. In 2020 "Tideline" was read by LeVar Burton for the Stitcher Radio podcast LeVar Burton Reads.