Peripheral arterial disease (PAD) is a manifestation of atherosclerotic vascular disease and is often associated with other comorbidities, such as hypertension, diabetes and dyslipidemia. An increasing body of evidence supports the notion that inflammation plays an important role in the development and progression of PAD. A number of studies have investigated the association of various acute phase proteins, particularly C-reactive protein (CRP), with PAD. Apart from CRP, other circulating biomarkers, such as matrix metalloproteinases (MMPs), selectins and interleukin (IL)-1, IL-2, IL-6, IL-8 and IL-10 have been considered to play a role in the development of PAD. In this review, the role of these circulating biomarkers in PAD is discussed. Current data indicate that the appropriate use of biomarkers in patients with PAD may contribute to an early diagnosis, an enhanced knowledge of the developmental process of the disease, as well as to the subsequent improvement of current therapies and to the development of new ones.