海岸桐属（学名：Guettarda）是茜草科下的一个属，为乔木或灌木植物。该属共有100种以上，分布于热带地区。

Guettarda is a plant genus in the family Rubiaceae. Most of these plants are known by the common name Velvetseed. Estimates of the number of species range from about 50 to 162. Most of the species are neotropical. Twenty are found in New Caledonia and one reaches Australia. A few others are found on islands and in coastal areas of the Indian and Pacific Oceans.