Hyderabad Rationalist Forum (HRF) is a rationalist group based in the twin cities of Hyderabad and Secunderabad in Andhra Pradesh, India. It aims to spread rationalist, humanist and atheist ideas, to encourage intercultural marriages, and to curb superstitious practices. HRF publishes Rationalist voice, a bimonthly magazine in English. It is affiliated to the Federation of Indian Rationalist Associations. It is also an Associate Member of International Humanist and Ethical Union.