珊瑚纲（学名Anthozoa）是刺胞动物门的一个纲。例如海葵、石珊瑚、红珊瑚和已经绝灭的四射珊瑚、横板珊瑚等，全为海生。

• 身体为圆筒形单体，或为多种形状的群体，终生水螅型。
• 口卵圆或裂缝形，咽喉侧扁。
• 内腔被体壁伸展的隔膜分为若干小室，隔膜上部与咽喉相连接，下部游离，游离缘有弯曲肥厚的隔膜丝，其上有生殖腺。
• 雌雄异体。
• 有些珊瑚外层能分泌石灰质的骨骼，在海洋中堆积成珊瑚礁。

Anthozoa is a class within the phylum Cnidaria. Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Instead, they release sperm and eggs that form a planula, which attaches to some substrate on which the cnidarian grows. Some anthozoans can also reproduce ****ually through budding. More than 6,100 species have been described.