血淋巴（Hemolymph）是无脊椎动物血腔内流动的血样液体，无色，兼具血液和淋巴样组织液的特性，内含血细胞，间质液和血浆，可占动物体重的30-40%。主要起营养物质运输，温度调节和创伤愈合的作用。拥有血淋巴的动物有属于开放性循环系统（初级体腔和次级体腔的融合）的软体动物、节肢动物和尾索动物。而昆虫的氧气运输则是通过气管，而不是血淋巴完成的。

其作用是营养，清洁，传导热量，防御免疫，运输营养和骨骼作用，缓冲作用。

Hemolymph, or haemolymph, is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod body remaining in direct contact with the animal's tissues. It is composed of a fluid plasma in which hemolymph cells called hemocytes are suspended. In addition to hemocytes, the plasma also contains many chemicals. It is the major tissue type of the open circulatory system characteristic of arthropods (e.g. spiders, crustaceans and insects). In addition, some non-arthropods such as molluscs possess a hemolymphatic circulatory system.