蕹菜（学名：Ipomoea aquatica），又称空心菜、无心菜、通菜、通心菜、壅菜、瓮菜、应菜、藤菜及葛菜，为一年生草本植物，茎蔓性，中空，节上能生不定根。

蕹菜原产东南亚，但目前主要分布于长江以南温热带地区。在水田、池沼里种的称为「水蕹菜」，叶、藤管比旱地种植的大。

蕹菜的叶呈心形，叶柄很长；夏秋季开白色或淡紫色喇叭状花；种子淡褐或黑色；蕹菜性喜温暖湿润，生长势强，最大特点是耐涝耐炎热。在15℃—40℃条件下均能生长，耐连作。对土壤要求不严，适应性广，无论旱地水田，沟边地角都可栽植。夏季炎热高温仍能生长，但不耐寒，遇霜茎叶枯死，高温无霜地区可终年栽培。

Ipomoea aquatica is a semiaquatic, tropical plant grown as a vegetable for its tender shoots and leaves. It is found throughout the tropical and subtropical regions of the world, although it is not known where it originated. This plant is known in English as water spinach, river spinach, water morning glory, water convolvulus, or by the more ambiguous names Chinese spinach, Chinese Watercress, Chinese convolvulus, swamp cabbage or kangkong in Southeast Asia. Occasionally, it has also been mistakenly called "kale" in English, although kale is a strain of mustard belonging to the species Brassica oleracea and is completely unrelated to water spinach, which is a species of morning glory. It is known as phak bung in Thai and Laotian, ong choy in Cantonese, kongxincai (空心菜) in Mandarin Chinese, rau muống in Vietnamese, kangkong in Tagalog, ကန်စွန်း, gazun in Myanmar, trokuon (ត្រកួន) in Khmer, kolmou xak in Assamese, kalmi saag in Hindi, kalmi shak in Bengali, Thooti Koora in Telugu, kangkung in Indonesian, Malay and Sinhalese and hayoyo in Ghana. In Suriname (South-America) it's known as dagoeblad or dagublad.