双线舌鳎（学名：Cynoglossus bilineatus）为辐鳍鱼纲鲽形目鳎亚目舌鳎科舌鳎属的鱼类，俗名双线鞋底鱼、重双线鳎、龙利。分布于西达红海及桑给巴尔、南达昆士兰及美拉尼西亚、北达日本南部以及海南岛、两广到福建、台湾等近海等，属于暖水性浅海底层鱼，栖息深度10-400公尺，体长可达44公分，栖息在沿岸沙泥底质水域、河口或大陆棚，以底栖性无脊椎动物为食，可做为食用鱼。该物种的模式产地在中国。

Cynoglossus quadrilineatus, the Fourlined tonguesole is a species of tonguefish native to the Indian Ocean from Pakistan to the western Pacific Ocean where it occurs from Japan to northern Australia. It can be found in marine and brackish waters (entering fresh waters in the tidal zone of the Mekong River) in estuaries and coastal waters out to the continental shelf at depths of from 10 to 400 metres (33 to 1,312 ft). This species can reach a length of 44 centimetres (17 in) SL though most do not exceed 30 centimetres (12 in) SL. It is important in local commercial fisheries.