普通狨（学名 Callithrix (Callithrix) jacchus），是狨属的典型物种，属于新世界猴，主要分布于巴西东部。

普通狨的毛色呈灰色。耳边有一簇白色长发，所以也叫绒耳狨，前额有白色印记，脸部没有毛，尾巴为灰白色。成年狨的体长为14-18厘米，体重约为400克。

普通狨在白天活动，主要在树上攀爬和跳跃，有时也出现在平地上。

普通狨以4-15只组成一群，通常为一个家庭。活动区域在300,000平方米。群体中有严格的等级观念。

普通狨以昆虫、蜘蛛、小脊椎动物和鸟蛋为食。

普通狨的孕期约为150天，每胎一般产两仔，最多有产四仔的记录。幼仔的体重大约是成体的20%-27%，性成熟期为，雄性一年，雌性20-24个月。

The common marmoset (Callithrix jacchus) is a New World monkey. It originally lived on the Northeastern coast of Brazil, in the states of Piaui, Paraiba, Ceará, Rio Grande do Norte, Pernambuco, Alagoas and Bahia. Through release (both intentional and unintentional) of captive individuals, it has expanded its range since the 1920s to Southeast Brazil (its first sighting in the wild for Rio de Janeiro was in 1929) and became there an invasive species, raising concerns about genetic pollution of similar species, such as the buffy-tufted marmoset (Callithrix aurita), and predation upon bird nestlings and eggs.