Martensia is a genus of red algae, containing the following species: * Martensia albida Y.Lee, 2006 * Martensia australis Harvey, 1855 * Martensia bibarii Y.Lee, 2004 * Martensia denticulata Harvey, 1855 * Martensia elegans Hering, 1841 * Martensia flabelliformis Harvey ex J.Agardh, 1863 * Martensia flammifolia Y.Lee, 2006 * Martensia formosana S.-M.Lin, Hommersand & Fredericq, 2004 * Martensia fragilis Harvey, 1854 * Martensia indica V.Krishnamurthy & Thomas, 1977 * Martensia jejuensis Y.Lee, 2004 * Martensia lewisiae S.-M.Lin, Hommersand & Fredericq, 2004 * Martensia martensii (F.Schmitz) S.-M.Lin, Fredericq & L.M.Liao, 2001 * Martensia natalensis S.-M.Lin, Hommersand, Fredericq & De Clerck, 2009 * Martensia palmata Y.Lee, 2005 * Martensia projecta Y.Lee, 2005