Historically, it has been known that human rights, considered under their local and international protection systems, can be enforced vertically against the State. Nevertheless, in the last years, the third-party effect, which states that rights can be enforced between individuals, has taken great importance among jurists and jurisprudence. This article will analyze the development and implications of the third-party effect from international law and Ecuadorian constitutional law, looking them as complements for the protection of human rights.