Abstract: The present paper reports four new species of Chinese marine red algae belonging to Ahnfeltiales and Gigartinales. They are Ahnfeltia yinggehaiensis Xia et Zhang, Ahnfeltiopsis guangdongensis Xia et Zhang, Ahnfeltiopsis hainanensis Xia et Zhang, Ahnfeltiopsis masudai Xia et Zhang. Key words Ahnfeltia；A．yinggehaiensis；Ahnfeltiopsis；A．guangdongensis；A．hainanensis；A．masudai；Hainan；Guangdong；New species