浴缸是一种水管设备，供沐浴或淋浴之用，通常设备在家居浴室内。现代的浴缸大多以压克力或玻璃纤维制造，亦有以包上陶瓷的钢铁、木材制造或是用砖块、瓷砖砌成。旧式西方浴缸通常由防锈处理过（galvanized）的钢或铁制造。传统日本式风吕或中国式澡桶则以木材制造。

一直以来，大部份浴缸皆属长方型，近年由于亚加力加热制浴缸逐渐普及，开始出现各种不同形状的浴缸。浴缸最常见的颜色是白色，亦有其他例如粉色等色调。多数浴缸底部皆有去水位，亦在上部设有防满泻的去水位。一些则把水喉安装在浴缸边缘位置。

把铸铁浴缸涂上搪瓷的制造过程由美籍苏格兰人David Dunbar Buick发明，其后他发明OHV引擎，并创办Buick汽车公司。

A bathtub, bath or tub (informal) is a large container for holding water in which a person may bathe. Most modern bathtubs are made of acrylic or fiberglass, but alternatives are available in enamel on steel or cast iron; occasionally, waterproof finished wood. A bathtub is usually placed in a bathroom either as a stand-alone fixture or in conjunction with a shower.