Halicyclops is a genus of copepods belonging to the family Cyclopidae. There are currently 93 described species found in brackish habitats throughout the world: * Halicyclops aberrans C. E. F. Rocha, 1983 * Halicyclops aequoreus (Fischer, 1860) * Halicyclops ambiguus Kiefer, 1967 * Halicyclops antiguaensis Herbst, 1983 * Halicyclops aquaesurgentis Bozic, 1964 * Halicyclops ariakensis Ueda & Nagai, 2009 * Halicyclops blachei Lindberg, 1952 * Halicyclops bowmani C. E. F. Rocha & Iliffe, 1993 * Halicyclops calm Karanovic, 2006 * Halicyclops caneki Fiers, 1995 * Halicyclops canuensis (Bourne, 1890) * Halicyclops canui Lindberg, 1941 * Halicyclops caridophilus Humes, 1947 * Halicyclops cenoticola C. E. F. Rocha, Iliffe, Reid & Suárez-Morales, 1998 * Halicyclops christianensis (Bo