Exocentrus lusitanus is a species of longhorn beetles of the subfamily Lamiinae. It was described by Linnaeus in 1767, and is known from Europe and western Russia. The beetles inhabit broadleaf trees, particularly lime trees and sometimes hazels. The larvae feed on dead tree material under bark and in branches and twigs. They measure 3.5–6 millimetres (0.14–0.24 in) in length as adults, and can live for approximately 2 years.