The Hungarian Civil Liberties Union (HCLU) is a non-profit human rights watchdog NGO established in Budapest, Hungary in 1994.

HCLU is a law reform and legal defence public interest NGO in Hungary, working independently of political parties, the state or any of its institutions. HCLU's aim is to promote the case of fundamental rights and principles laid down by the Constitution of the Republic of Hungary and by international conventions. Generally it has the goal of building and strengthening the civil society and rule of law in Hungary and the CEE region. Since HCLU is an independent non-profit organization the financial resources are largely provided by foundations and increasingly by individuals.