Giardia intestinalis is a protozoan parasiting the gastrointestinal tract of vertebrate hosts widely distributed throughout the world. Patients with giardiasis are usually asymptomatic but the presence of the parasite may lead to a variety of clinical manifestations, including skin lesions. In this report we present a case of a 31-year-old female patient with skin lesions of granuloma annulare type confirmed by a skin biopsy, who was diagnosed with giardiasis. The clearance of the skin lesions after antiparasite treatment seems to support correlation between dermatological symptoms and infection with Giardia intestinalis.