Acanthocyclops is a genus of copepod crustaceans in the family Cyclopidae. It was originally described by Friedrich Kiefer as a subgenus of Cyclops, and contains the following species: * Acanthocyclops abyssicola (Lilljeborg, 1901) * Acanthocyclops agamus Kiefer, 1938 * Acanthocyclops alticola (Kiefer, 1935) * Acanthocyclops americanus (Marsh, 1893) * Acanthocyclops arenosus Mazepova, 1950 * Acanthocyclops balcanicus Naidenov & Pandourski, 1992 * Acanthocyclops biarticulatus Monchenko, 1972 * Acanthocyclops bicuspidatus (Claus, 1857) * Acanthocyclops bisetosus (Rehberg, 1880) * Acanthocyclops brachypus (Kiefer, 1955) * Acanthocyclops brevispinosus (Herrick, 1884) * Acanthocyclops caesariatus Mercado-Salas & Suárez-Morales, 2009 * Acanthocyclops capillatus (Sars, 1863) * Acant